21210312312122 has 8 divisors (see below), whose sum is σ = 31827662982900. Its totient is φ = 10601091317824.

The previous prime is 21210312312109. The next prime is 21210312312143. The reversal of 21210312312122 is 22121321301212.

It can be written as a sum of positive squares in 2 ways, for example, as 19914879086881 + 1295433225241 = 4462609^2 + 1138171^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2032412597 + ... + 2032423032.

Almost surely, 2^{21210312312122} is an apocalyptic number.

21210312312122 is a deficient number, since it is larger than the sum of its proper divisors (10617350670778).

21210312312122 is a wasteful number, since it uses less digits than its factorization.

21210312312122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4064838240.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21210312312122 its reverse (22121321301212), we get a palindrome (43331633613334).

The spelling of 21210312312122 in words is "twenty-one trillion, two hundred ten billion, three hundred twelve million, three hundred twelve thousand, one hundred twenty-two".