21320013132 has 96 divisors (see below), whose sum is σ = 61287744000. Its totient is φ = 6354676800.

The previous prime is 21320013073. The next prime is 21320013133. The reversal of 21320013132 is 23131002312.

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

It is not an unprimeable number, because it can be changed into a prime (21320013133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74632 + ... + 219567.

It is an arithmetic number, because the mean of its divisors is an integer number (638414000).

Almost surely, 2^21320013132 is an apocalyptic number.

21320013132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21320013132 is an abundant number, since it is smaller than the sum of its proper divisors (39967730868).

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

21320013132 is a wasteful number, since it uses less digits than its factorization.

21320013132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294284 (or 294276 counting only the distinct ones).

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

Adding to 21320013132 its reverse (23131002312), we get a palindrome (44451015444).

The spelling of 21320013132 in words is "twenty-one billion, three hundred twenty million, thirteen thousand, one hundred thirty-two".