21663225503631 has 24 divisors (see below), whose sum is σ = 32939539825920. Its totient is φ = 13681496239056.

The previous prime is 21663225503599. The next prime is 21663225503671. The reversal of 21663225503631 is 13630552236612.

21663225503631 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 3 + 2 + 2 + 5 + 5 + 0 + 3 + 631 = 666.

It is not a de Polignac number, because 21663225503631 - 2⁵ = 21663225503599 is a prime.

It is a super-2 number, since 2×21663225503631² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21663225503671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1855780 + ... + 6838886.

It is an arithmetic number, because the mean of its divisors is an integer number (1372480826080).

Almost surely, 2^{21663225503631} is an apocalyptic number.

21663225503631 is a deficient number, since it is larger than the sum of its proper divisors (11276314322289).

21663225503631 is a wasteful number, since it uses less digits than its factorization.

21663225503631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5008555 (or 5008552 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 45.

The spelling of 21663225503631 in words is "twenty-one trillion, six hundred sixty-three billion, two hundred twenty-five million, five hundred three thousand, six hundred thirty-one".