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21002012200 = 23521341271727
BaseRepresentation
bin10011100011110100…
…010100011000101000
32000012122222202120201
4103203310110120220
5321003003342300
613352002001544
71342310105161
oct234364243050
960178882521
1021002012200
1189a80a7684
1240a16462b4
131c9916a970
1410333d8768
1582dbe866a
hex4e3d14628

21002012200 has 192 divisors, whose sum is σ = 54141534720. Its totient is φ = 7527168000.

The previous prime is 21002012147. The next prime is 21002012201. The reversal of 21002012200 is 221020012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21002012201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28888237 + ... + 28888963.

It is an arithmetic number, because the mean of its divisors is an integer number (281987160).

Almost surely, 221002012200 is an apocalyptic number.

21002012200 is a gapful number since it is divisible by the number (20) 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 21002012200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27070767360).

21002012200 is an abundant number, since it is smaller than the sum of its proper divisors (33139522520).

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

21002012200 is a wasteful number, since it uses less digits than its factorization.

21002012200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068 (or 1059 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21002012200 its reverse (221020012), we get a palindrome (21223032212).

The spelling of 21002012200 in words is "twenty-one billion, two million, twelve thousand, two hundred".