21204130332 has 96 divisors (see below), whose sum is σ = 63811883520. Its totient is φ = 5317643520.

The previous prime is 21204130291. The next prime is 21204130369. The reversal of 21204130332 is 23303140212.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21204130299 and 21204130308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 368863 + ... + 422454.

It is an arithmetic number, because the mean of its divisors is an integer number (664707120).

Almost surely, 2^21204130332 is an apocalyptic number.

21204130332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21204130332 is an abundant number, since it is smaller than the sum of its proper divisors (42607753188).

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

21204130332 is a wasteful number, since it uses less digits than its factorization.

21204130332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791371 (or 791369 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21204130332 its reverse (23303140212), we get a palindrome (44507270544).

The spelling of 21204130332 in words is "twenty-one billion, two hundred four million, one hundred thirty thousand, three hundred thirty-two".