21331010232 has 64 divisors (see below), whose sum is σ = 67717497600. Its totient is φ = 6094573920.

The previous prime is 21331010227. The next prime is 21331010237. The reversal of 21331010232 is 23201013312.

It is an interprime number because it is at equal distance from previous prime (21331010227) and next prime (21331010237).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331010237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7052394 + ... + 7055417.

It is an arithmetic number, because the mean of its divisors is an integer number (1058085900).

Almost surely, 2^21331010232 is an apocalyptic number.

It is an amenable number.

21331010232 is an abundant number, since it is smaller than the sum of its proper divisors (46386487368).

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

21331010232 is a wasteful number, since it uses less digits than its factorization.

21331010232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14107833 (or 14107823 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21331010232 its reverse (23201013312), we get a palindrome (44532023544).

The spelling of 21331010232 in words is "twenty-one billion, three hundred thirty-one million, ten thousand, two hundred thirty-two".