21963619839636 has 48 divisors (see below), whose sum is σ = 57081942467200. Its totient is φ = 7303306337856.

The previous prime is 21963619839571. The next prime is 21963619839641. The reversal of 21963619839636 is 63693891636912.

21963619839636 is a `hidden beast` number, since 2 + 1 + 9 + 63 + 61 + 98 + 396 + 36 = 666.

It is a super-2 number, since 2×21963619839636² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248570560 + ... + 248658903.

Almost surely, 2^{21963619839636} is an apocalyptic number.

It is an amenable number.

21963619839636 is an abundant number, since it is smaller than the sum of its proper divisors (35118322627564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21963619839636 is a wasteful number, since it uses less digits than its factorization.

21963619839636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497229885 (or 497229877 counting only the distinct ones).

The product of its digits is 408146688, while the sum is 72.

The spelling of 21963619839636 in words is "twenty-one trillion, nine hundred sixty-three billion, six hundred nineteen million, eight hundred thirty-nine thousand, six hundred thirty-six".