21912963696 has 400 divisors, whose sum is σ = 71884524096. Its totient is φ = 6393987072.

The previous prime is 21912963649. The next prime is 21912963703. The reversal of 21912963696 is 69636921912.

21912963696 is a `hidden beast` number, since 2 + 191 + 2 + 96 + 369 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 74788126 + ... + 74788418.

Almost surely, 2^21912963696 is an apocalyptic number.

21912963696 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21912963696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35942262048).

21912963696 is an abundant number, since it is smaller than the sum of its proper divisors (49971560400).

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

21912963696 is a wasteful number, since it uses less digits than its factorization.

21912963696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 527 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 54.

The spelling of 21912963696 in words is "twenty-one billion, nine hundred twelve million, nine hundred sixty-three thousand, six hundred ninety-six".