21012323122 has 16 divisors (see below), whose sum is σ = 36023060160. Its totient is φ = 9004797648.

The previous prime is 21012323089. The next prime is 21012323159. The reversal of 21012323122 is 22132321012.

It is a self number, because there is not a number n which added to its sum of digits gives 21012323122.

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, 382788 + ... + 434224.

It is an arithmetic number, because the mean of its divisors is an integer number (2251441260).

Almost surely, 2^21012323122 is an apocalyptic number.

21012323122 is a deficient number, since it is larger than the sum of its proper divisors (15010737038).

21012323122 is a wasteful number, since it uses less digits than its factorization.

21012323122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80625.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21012323122 its reverse (22132321012), we get a palindrome (43144644134).

The spelling of 21012323122 in words is "twenty-one billion, twelve million, three hundred twenty-three thousand, one hundred twenty-two".