21130402132 has 24 divisors (see below), whose sum is σ = 44485058240. Its totient is φ = 8579260800.

The previous prime is 21130402123. The next prime is 21130402133. The reversal of 21130402132 is 23120403112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130402133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19858869 + ... + 19859932.

Almost surely, 2^21130402132 is an apocalyptic number.

It is an amenable number.

21130402132 is an abundant number, since it is smaller than the sum of its proper divisors (23354656108).

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

21130402132 is a wasteful number, since it uses less digits than its factorization.

21130402132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39718831 (or 39718829 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21130402132 its reverse (23120403112), we get a palindrome (44250805244).

The spelling of 21130402132 in words is "twenty-one billion, one hundred thirty million, four hundred two thousand, one hundred thirty-two".