21200001002120 has 32 divisors (see below), whose sum is σ = 47705126065920. Its totient is φ = 8479089501120.

The previous prime is 21200001002101. The next prime is 21200001002233. The reversal of 21200001002120 is 2120010000212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28088522 + ... + 28833401.

It is an arithmetic number, because the mean of its divisors is an integer number (1490785189560).

Almost surely, 2^{21200001002120} is an apocalyptic number.

21200001002120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200001002120 is an abundant number, since it is smaller than the sum of its proper divisors (26505125063800).

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

21200001002120 is a wasteful number, since it uses less digits than its factorization.

21200001002120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56931245 (or 56931241 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21200001002120 its reverse (2120010000212), we get a palindrome (23320011002332).

The spelling of 21200001002120 in words is "twenty-one trillion, two hundred billion, one million, two thousand, one hundred twenty".