21132121232 has 20 divisors (see below), whose sum is σ = 40951506540. Its totient is φ = 10563990528.

The previous prime is 21132121229. The next prime is 21132121243. The reversal of 21132121232 is 23212123112.

It can be written as a sum of positive squares in 2 ways, for example, as 18960188416 + 2171932816 = 137696^2 + 46604^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43433 + ... + 210120.

It is an arithmetic number, because the mean of its divisors is an integer number (2047575327).

Almost surely, 2^21132121232 is an apocalyptic number.

It is an amenable number.

21132121232 is a deficient number, since it is larger than the sum of its proper divisors (19819385308).

21132121232 is a wasteful number, since it uses less digits than its factorization.

21132121232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258770 (or 258764 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

Adding to 21132121232 its reverse (23212123112), we get a palindrome (44344244344).

The spelling of 21132121232 in words is "twenty-one billion, one hundred thirty-two million, one hundred twenty-one thousand, two hundred thirty-two".