21012210111200 has 144 divisors (see below), whose sum is σ = 63953526962304. Its totient is φ = 6549260275200.

The previous prime is 21012210111187. The next prime is 21012210111223. The reversal of 21012210111200 is 211101221012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 170492054 + ... + 170615253.

It is an arithmetic number, because the mean of its divisors is an integer number (444121715016).

Almost surely, 2^{21012210111200} is an apocalyptic number.

21012210111200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012210111200 is an abundant number, since it is smaller than the sum of its proper divisors (42941316851104).

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

21012210111200 is a wasteful number, since it uses less digits than its factorization.

21012210111200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341107345 (or 341107332 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21012210111200 its reverse (211101221012), we get a palindrome (21223311332212).

The spelling of 21012210111200 in words is "twenty-one trillion, twelve billion, two hundred ten million, one hundred eleven thousand, two hundred".