21302013132 has 108 divisors (see below), whose sum is σ = 59688182736. Its totient is φ = 6392348160.

The previous prime is 21302013113. The next prime is 21302013137. The reversal of 21302013132 is 23131020312.

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 (21302013137) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 194782 + ... + 283802.

Almost surely, 2^21302013132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21302013132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29844091368).

21302013132 is an abundant number, since it is smaller than the sum of its proper divisors (38386169604).

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

21302013132 is a wasteful number, since it uses less digits than its factorization.

21302013132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89088 (or 89066 counting only the distinct ones).

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

Adding to 21302013132 its reverse (23131020312), we get a palindrome (44433033444).

The spelling of 21302013132 in words is "twenty-one billion, three hundred two million, thirteen thousand, one hundred thirty-two".