21311233132 has 24 divisors (see below), whose sum is σ = 44092208160. Its totient is φ = 8818440960.

The previous prime is 21311233127. The next prime is 21311233159. The reversal of 21311233132 is 23133211312.

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, 13121869 + ... + 13123492.

It is an arithmetic number, because the mean of its divisors is an integer number (1837175340).

Almost surely, 2^21311233132 is an apocalyptic number.

It is an amenable number.

21311233132 is an abundant number, since it is smaller than the sum of its proper divisors (22780975028).

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

21311233132 is a wasteful number, since it uses less digits than its factorization.

21311233132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26245401 (or 26245399 counting only the distinct ones).

The product of its digits is 648, while the sum is 22.

Adding to 21311233132 its reverse (23133211312), we get a palindrome (44444444444).

The spelling of 21311233132 in words is "twenty-one billion, three hundred eleven million, two hundred thirty-three thousand, one hundred thirty-two".