21956673240 has 96 divisors (see below), whose sum is σ = 74002153680. Its totient is φ = 5855110272.

The previous prime is 21956673181. The next prime is 21956673253. The reversal of 21956673240 is 4237665912.

21956673240 is a `hidden beast` number, since 2 + 19 + 566 + 7 + 32 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1119739 + ... + 1139178.

Almost surely, 2^21956673240 is an apocalyptic number.

21956673240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21956673240 is an abundant number, since it is smaller than the sum of its proper divisors (52045480440).

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

21956673240 is a wasteful number, since it uses less digits than its factorization.

21956673240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2258943 (or 2258927 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 21956673240 in words is "twenty-one billion, nine hundred fifty-six million, six hundred seventy-three thousand, two hundred forty".