21200021122202 has 16 divisors (see below), whose sum is σ = 34246902719400. Its totient is φ = 9784420918272.

The previous prime is 21200021122157. The next prime is 21200021122213. The reversal of 21200021122202 is 20222112000212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5861526681481 + 15338494440721 = 2421059^2 + 3916439^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7235663 + ... + 9734210.

Almost surely, 2^{21200021122202} is an apocalyptic number.

21200021122202 is a deficient number, since it is larger than the sum of its proper divisors (13046881597198).

21200021122202 is a wasteful number, since it uses less digits than its factorization.

21200021122202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17017937.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21200021122202 its reverse (20222112000212), we get a palindrome (41422133122414).

The spelling of 21200021122202 in words is "twenty-one trillion, two hundred billion, twenty-one million, one hundred twenty-two thousand, two hundred two".