21230013132 has 36 divisors (see below), whose sum is σ = 53693069976. Its totient is φ = 7072937280.

The previous prime is 21230013131. The next prime is 21230013137. The reversal of 21230013132 is 23131003212.

It is a tau number, because it is divible by the number of its divisors (36).

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 (21230013131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85969 + ... + 223272.

It is an arithmetic number, because the mean of its divisors is an integer number (1491474166).

Almost surely, 2^21230013132 is an apocalyptic number.

It is an amenable number.

21230013132 is an abundant number, since it is smaller than the sum of its proper divisors (32463056844).

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

21230013132 is a wasteful number, since it uses less digits than its factorization.

21230013132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311158 (or 311153 counting only the distinct ones).

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

Adding to 21230013132 its reverse (23131003212), we get a palindrome (44361016344).

The spelling of 21230013132 in words is "twenty-one billion, two hundred thirty million, thirteen thousand, one hundred thirty-two".