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1231122021200 = 24522329759981
BaseRepresentation
bin10001111010100100100…
…101110011101101010000
311100200202000021121002022
4101322210211303231100
5130132314214134300
62341323013311012
7154642231342511
oct21724445635520
94320660247068
101231122021200
11435130316275
1217a724335468
138c12c270b76
144382d9a4a08
152205709a285
hex11ea4973b50

1231122021200 has 180 divisors, whose sum is σ = 3123888592188. Its totient is φ = 466174156800.

The previous prime is 1231122021161. The next prime is 1231122021251. The reversal of 1231122021200 is 21202211321.

It can be written as a sum of positive squares in 6 ways, for example, as 147674192656 + 1083447828544 = 384284^2 + 1040888^2 .

It is a super-2 number, since 2×12311220212002 (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20495210 + ... + 20555190.

Almost surely, 21231122021200 is an apocalyptic number.

1231122021200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231122021200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1561944296094).

1231122021200 is an abundant number, since it is smaller than the sum of its proper divisors (1892766570988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231122021200 is a wasteful number, since it uses less digits than its factorization.

1231122021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60142 (or 60108 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1231122021200 its reverse (21202211321), we get a palindrome (1252324232521).

The spelling of 1231122021200 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-two million, twenty-one thousand, two hundred".