21531103332 has 48 divisors (see below), whose sum is σ = 50552646144. Its totient is φ = 7132320000.

The previous prime is 21531103261. The next prime is 21531103361. The reversal of 21531103332 is 23330113512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4235032 + ... + 4240112.

It is an arithmetic number, because the mean of its divisors is an integer number (1053180128).

Almost surely, 2^21531103332 is an apocalyptic number.

It is an amenable number.

21531103332 is an abundant number, since it is smaller than the sum of its proper divisors (29021542812).

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

21531103332 is a wasteful number, since it uses less digits than its factorization.

21531103332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7220 (or 7218 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 24.

Adding to 21531103332 its reverse (23330113512), we get a palindrome (44861216844).

The spelling of 21531103332 in words is "twenty-one billion, five hundred thirty-one million, one hundred three thousand, three hundred thirty-two".