21200102002120 has 32 divisors (see below), whose sum is σ = 47803253800320. Its totient is φ = 8461725370560.

The previous prime is 21200102002097. The next prime is 21200102002127. The reversal of 21200102002120 is 2120020100212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21200102002120.

It is not an unprimeable number, because it can be changed into a prime (21200102002127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 572338446 + ... + 572375485.

It is an arithmetic number, because the mean of its divisors is an integer number (1493851681260).

Almost surely, 2^{21200102002120} is an apocalyptic number.

21200102002120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200102002120 is an abundant number, since it is smaller than the sum of its proper divisors (26603151798200).

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

21200102002120 is a wasteful number, since it uses less digits than its factorization.

21200102002120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144714405 (or 1144714401 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21200102002120 its reverse (2120020100212), we get a palindrome (23320122102332).

The spelling of 21200102002120 in words is "twenty-one trillion, two hundred billion, one hundred two million, two thousand, one hundred twenty".