21963942864 has 60 divisors (see below), whose sum is σ = 61952590336. Its totient is φ = 7263660096.

The previous prime is 21963942839. The next prime is 21963942883. The reversal of 21963942864 is 46824936912.

21963942864 is a `hidden beast` number, since 2 + 196 + 394 + 2 + 8 + 64 = 666.

It is a super-2 number, since 2×21963942864² (a number of 21 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21963942864.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 582214 + ... + 618789.

Almost surely, 2^21963942864 is an apocalyptic number.

21963942864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21963942864 is an abundant number, since it is smaller than the sum of its proper divisors (39988647472).

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

21963942864 is a wasteful number, since it uses less digits than its factorization.

21963942864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201144 (or 1201135 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The spelling of 21963942864 in words is "twenty-one billion, nine hundred sixty-three million, nine hundred forty-two thousand, eight hundred sixty-four".