21002122111200 has 144 divisors (see below), whose sum is σ = 68367173814576. Its totient is φ = 5600134451200.

The previous prime is 21002122111193. The next prime is 21002122111213. The reversal of 21002122111200 is 211122120012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21002122111200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31447954 + ... + 32108846.

It is an arithmetic number, because the mean of its divisors is an integer number (474772040379).

Almost surely, 2^{21002122111200} is an apocalyptic number.

21002122111200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002122111200 is an abundant number, since it is smaller than the sum of its proper divisors (47365051703376).

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

21002122111200 is a wasteful number, since it uses less digits than its factorization.

21002122111200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674157 (or 674144 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21002122111200 its reverse (211122120012), we get a palindrome (21213244231212).

It can be divided in two parts, 210021 and 22111200, that added together give a triangular number (22321221 = T₆₆₈₁).

The spelling of 21002122111200 in words is "twenty-one trillion, two billion, one hundred twenty-two million, one hundred eleven thousand, two hundred".