21210121122 has 16 divisors (see below), whose sum is σ = 42421922400. Its totient is φ = 7069760352.

The previous prime is 21210121081. The next prime is 21210121147. The reversal of 21210121122 is 22112101212.

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, 144813 + ... + 251775.

It is an arithmetic number, because the mean of its divisors is an integer number (2651370150).

Almost surely, 2^21210121122 is an apocalyptic number.

21210121122 is an abundant number, since it is smaller than the sum of its proper divisors (21211801278).

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

21210121122 is a wasteful number, since it uses less digits than its factorization.

21210121122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140017.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21210121122 its reverse (22112101212), we get a palindrome (43322222334).

The spelling of 21210121122 in words is "twenty-one billion, two hundred ten million, one hundred twenty-one thousand, one hundred twenty-two".