21331232032 has 48 divisors (see below), whose sum is σ = 46931107104. Its totient is φ = 9459520000.

The previous prime is 21331232023. The next prime is 21331232051. The reversal of 21331232032 is 23023213312.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21331231994 and 21331232012.

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, 724594 + ... + 753457.

It is an arithmetic number, because the mean of its divisors is an integer number (977731398).

Almost surely, 2^21331232032 is an apocalyptic number.

21331232032 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21331232032 is an abundant number, since it is smaller than the sum of its proper divisors (25599875072).

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

21331232032 is a wasteful number, since it uses less digits than its factorization.

21331232032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478113 (or 1478105 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21331232032 its reverse (23023213312), we get a palindrome (44354445344).

The spelling of 21331232032 in words is "twenty-one billion, three hundred thirty-one million, two hundred thirty-two thousand, thirty-two".