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1212620121 = 32134735569
BaseRepresentation
bin100100001000111…
…0001110101011001
310010111202111002100
41020101301311121
54440412320441
6320154354013
742023046426
oct11021616531
93114674070
101212620121
11572546499
1229a12b909
131642c27cb
14b7096d4d
15716cecb6
hex48471d59

1212620121 has 6 divisors (see below), whose sum is σ = 1751562410. Its totient is φ = 808413408.

The previous prime is 1212620117. The next prime is 1212620161. The reversal of 1212620121 is 1210262121.

1212620121 is a `hidden beast` number, since 1 + 21 + 2 + 620 + 1 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 731432025 + 481188096 = 27045^2 + 21936^2 .

It is not a de Polignac number, because 1212620121 - 22 = 1212620117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1212620094 and 1212620103.

It is not an unprimeable number, because it can be changed into a prime (1212620111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67367776 + ... + 67367793.

Almost surely, 21212620121 is an apocalyptic number.

It is an amenable number.

1212620121 is a deficient number, since it is larger than the sum of its proper divisors (538942289).

1212620121 is a wasteful number, since it uses less digits than its factorization.

1212620121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134735575 (or 134735572 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1212620121 is about 34822.6954872824. The cubic root of 1212620121 is about 1066.3708301436.

Adding to 1212620121 its reverse (1210262121), we get a palindrome (2422882242).

The spelling of 1212620121 in words is "one billion, two hundred twelve million, six hundred twenty thousand, one hundred twenty-one".

Divisors: 1 3 9 134735569 404206707 1212620121