21631563503087 has 2 divisors, whose sum is σ = 21631563503088. Its totient is φ = 21631563503086.

The previous prime is 21631563503009. The next prime is 21631563503129. The reversal of 21631563503087 is 78030536513612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21631563503087 - 2⁸ = 21631563502831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21631566503087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10815781751543 + 10815781751544.

It is an arithmetic number, because the mean of its divisors is an integer number (10815781751544).

Almost surely, 2^{21631563503087} is an apocalyptic number.

21631563503087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21631563503087 is an equidigital number, since it uses as much as digits as its factorization.

21631563503087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2721600, while the sum is 50.

The spelling of 21631563503087 in words is "twenty-one trillion, six hundred thirty-one billion, five hundred sixty-three million, five hundred three thousand, eighty-seven".