21131121032 has 24 divisors (see below), whose sum is σ = 46089563310. Its totient is φ = 9056194560.

The previous prime is 21131121019. The next prime is 21131121047. The reversal of 21131121032 is 23012113112.

It can be written as a sum of positive squares in only one way, i.e., 20757317476 + 373803556 = 144074^2 + 19334^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21131121032.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26952569 + ... + 26953352.

Almost surely, 2^21131121032 is an apocalyptic number.

It is an amenable number.

21131121032 is an abundant number, since it is smaller than the sum of its proper divisors (24958442278).

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

21131121032 is a wasteful number, since it uses less digits than its factorization.

21131121032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53905941 (or 53905930 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21131121032 its reverse (23012113112), we get a palindrome (44143234144).

The spelling of 21131121032 in words is "twenty-one billion, one hundred thirty-one million, one hundred twenty-one thousand, thirty-two".