21133431032 has 16 divisors (see below), whose sum is σ = 45285923760. Its totient is φ = 9057184704.

The previous prime is 21133431019. The next prime is 21133431071. The reversal of 21133431032 is 23013433112.

It is a junction number, because it is equal to n+sod(n) for n = 21133430989 and 21133431007.

It is a congruent number.

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, 188691293 + ... + 188691404.

It is an arithmetic number, because the mean of its divisors is an integer number (2830370235).

Almost surely, 2^21133431032 is an apocalyptic number.

It is an amenable number.

21133431032 is an abundant number, since it is smaller than the sum of its proper divisors (24152492728).

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

21133431032 is a wasteful number, since it uses less digits than its factorization.

21133431032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377382710 (or 377382706 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21133431032 its reverse (23013433112), we get a palindrome (44146864144).

The spelling of 21133431032 in words is "twenty-one billion, one hundred thirty-three million, four hundred thirty-one thousand, thirty-two".