21523632502 has 4 divisors (see below), whose sum is σ = 32285448756. Its totient is φ = 10761816250.

The previous prime is 21523632491. The next prime is 21523632547. The reversal of 21523632502 is 20523632512.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5380908124 + ... + 5380908127.

It is an arithmetic number, because the mean of its divisors is an integer number (8071362189).

Almost surely, 2^21523632502 is an apocalyptic number.

21523632502 is a deficient number, since it is larger than the sum of its proper divisors (10761816254).

21523632502 is a wasteful number, since it uses less digits than its factorization.

21523632502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10761816253.

The product of its (nonzero) digits is 21600, while the sum is 31.

The spelling of 21523632502 in words is "twenty-one billion, five hundred twenty-three million, six hundred thirty-two thousand, five hundred two".