21156303632 has 20 divisors (see below), whose sum is σ = 41003876700. Its totient is φ = 10574658048.

The previous prime is 21156303629. The next prime is 21156303671. The reversal of 21156303632 is 23630365112.

It can be written as a sum of positive squares in 2 ways, for example, as 5937627136 + 15218676496 = 77056^2 + 123364^2 .

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, 168053 + ... + 265620.

It is an arithmetic number, because the mean of its divisors is an integer number (2050193835).

Almost surely, 2^21156303632 is an apocalyptic number.

It is an amenable number.

21156303632 is a deficient number, since it is larger than the sum of its proper divisors (19847573068).

21156303632 is a wasteful number, since it uses less digits than its factorization.

21156303632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436730 (or 436724 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 32.

Adding to 21156303632 its reverse (23630365112), we get a palindrome (44786668744).

The spelling of 21156303632 in words is "twenty-one billion, one hundred fifty-six million, three hundred three thousand, six hundred thirty-two".