21202102122 has 32 divisors (see below), whose sum is σ = 43780552704. Its totient is φ = 6840691200.

The previous prime is 21202102111. The next prime is 21202102153. The reversal of 21202102122 is 22120120212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308079 + ... + 370562.

It is an arithmetic number, because the mean of its divisors is an integer number (1368142272).

Almost surely, 2^21202102122 is an apocalyptic number.

21202102122 is an abundant number, since it is smaller than the sum of its proper divisors (22578450582).

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

21202102122 is a wasteful number, since it uses less digits than its factorization.

21202102122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678814.

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

Adding to 21202102122 its reverse (22120120212), we get a palindrome (43322222334).

The spelling of 21202102122 in words is "twenty-one billion, two hundred two million, one hundred two thousand, one hundred twenty-two".