21020244132 has 12 divisors (see below), whose sum is σ = 49047236336. Its totient is φ = 7006748040.

The previous prime is 21020244109. The next prime is 21020244169. The reversal of 21020244132 is 23144202012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21020244099 and 21020244108.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 875843494 + ... + 875843517.

Almost surely, 2^21020244132 is an apocalyptic number.

It is an amenable number.

21020244132 is an abundant number, since it is smaller than the sum of its proper divisors (28026992204).

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

21020244132 is a wasteful number, since it uses less digits than its factorization.

21020244132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751687018 (or 1751687016 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21020244132 its reverse (23144202012), we get a palindrome (44164446144).

The spelling of 21020244132 in words is "twenty-one billion, twenty million, two hundred forty-four thousand, one hundred thirty-two".