21122110402 has 16 divisors (see below), whose sum is σ = 31802150520. Its totient is φ = 10521418752.

The previous prime is 21122110397. The next prime is 21122110433. The reversal of 21122110402 is 20401122112.

It can be written as a sum of positive squares in 4 ways, for example, as 21117611761 + 4498641 = 145319^2 + 2121^2 .

It is a super-2 number, since 2×21122110402² (a number of 21 digits) contains 22 as substring.

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, 2816674 + ... + 2824162.

Almost surely, 2^21122110402 is an apocalyptic number.

21122110402 is a deficient number, since it is larger than the sum of its proper divisors (10680040118).

21122110402 is a wasteful number, since it uses less digits than its factorization.

21122110402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12597.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21122110402 its reverse (20401122112), we get a palindrome (41523232514).

The spelling of 21122110402 in words is "twenty-one billion, one hundred twenty-two million, one hundred ten thousand, four hundred two".