21012200102120 has 32 divisors (see below), whose sum is σ = 48802529272320. Its totient is φ = 8133754877760.

The previous prime is 21012200102083. The next prime is 21012200102171. The reversal of 21012200102120 is 2120100221012.

It is a junction number, because it is equal to n+sod(n) for n = 21012200102095 and 21012200102104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8472660092 + ... + 8472662571.

It is an arithmetic number, because the mean of its divisors is an integer number (1525079039760).

Almost surely, 2^{21012200102120} is an apocalyptic number.

21012200102120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012200102120 is an abundant number, since it is smaller than the sum of its proper divisors (27790329170200).

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

21012200102120 is a wasteful number, since it uses less digits than its factorization.

21012200102120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16945322705 (or 16945322701 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21012200102120 its reverse (2120100221012), we get a palindrome (23132300323132).

The spelling of 21012200102120 in words is "twenty-one trillion, twelve billion, two hundred million, one hundred two thousand, one hundred twenty".