21631563503099 has 32 divisors (see below), whose sum is σ = 25128424247040. Its totient is φ = 18402953497600.

The previous prime is 21631563503087. The next prime is 21631563503129. The reversal of 21631563503099 is 99030536513612.

It is a cyclic number.

It is not a de Polignac number, because 21631563503099 - 2¹² = 21631563499003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21631563503099.

It is not an unprimeable number, because it can be changed into a prime (21631563503009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 381932087 + ... + 381988719.

It is an arithmetic number, because the mean of its divisors is an integer number (785263257720).

Almost surely, 2^{21631563503099} is an apocalyptic number.

21631563503099 is a deficient number, since it is larger than the sum of its proper divisors (3496860743941).

21631563503099 is a wasteful number, since it uses less digits than its factorization.

21631563503099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68251.

The product of its (nonzero) digits is 3936600, while the sum is 53.

The spelling of 21631563503099 in words is "twenty-one trillion, six hundred thirty-one billion, five hundred sixty-three million, five hundred three thousand, ninety-nine".