21002212012200 has 96 divisors (see below), whose sum is σ = 65135205812160. Its totient is φ = 5598151283200.

The previous prime is 21002212012163. The next prime is 21002212012207. The reversal of 21002212012200 is 221021220012.

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 21002212012200.

It is not an unprimeable number, because it can be changed into a prime (21002212012207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6241236 + ... + 8997635.

It is an arithmetic number, because the mean of its divisors is an integer number (678491727210).

Almost surely, 2^{21002212012200} is an apocalyptic number.

21002212012200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002212012200 is an abundant number, since it is smaller than the sum of its proper divisors (44132993799960).

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

21002212012200 is a wasteful number, since it uses less digits than its factorization.

21002212012200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15241187 (or 15241178 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21002212012200 its reverse (221021220012), we get a palindrome (21223233232212).

The spelling of 21002212012200 in words is "twenty-one trillion, two billion, two hundred twelve million, twelve thousand, two hundred".