21956487696 has 480 divisors, whose sum is σ = 75731264000. Its totient is φ = 6049105920.

The previous prime is 21956487659. The next prime is 21956487733. The reversal of 21956487696 is 69678465912.

21956487696 is a `hidden beast` number, since 2 + 1 + 9 + 564 + 8 + 7 + 69 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (21956487659) and next prime (21956487733).

Its product of digits (39191040) is a multiple of the sum of its prime factors (540).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 53683140 + ... + 53683548.

Almost surely, 2^21956487696 is an apocalyptic number.

21956487696 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 21956487696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37865632000).

21956487696 is an abundant number, since it is smaller than the sum of its proper divisors (53774776304).

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

21956487696 is a wasteful number, since it uses less digits than its factorization.

21956487696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540 (or 517 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 63.

The spelling of 21956487696 in words is "twenty-one billion, nine hundred fifty-six million, four hundred eighty-seven thousand, six hundred ninety-six".