21989674440720 has 240 divisors, whose sum is σ = 85014514615680. Its totient is φ = 4989523470336.

The previous prime is 21989674440703. The next prime is 21989674440737. The reversal of 21989674440720 is 2704447698912.

21989674440720 is a `hidden beast` number, since 2 + 19 + 8 + 96 + 74 + 440 + 7 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (21989674440703) and next prime (21989674440737).

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15232990 + ... + 16613949.

It is an arithmetic number, because the mean of its divisors is an integer number (354227144232).

Almost surely, 2^{21989674440720} is an apocalyptic number.

21989674440720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21989674440720 is an abundant number, since it is smaller than the sum of its proper divisors (63024840174960).

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

21989674440720 is a wasteful number, since it uses less digits than its factorization.

21989674440720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31847102 (or 31847093 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 63.

The spelling of 21989674440720 in words is "twenty-one trillion, nine hundred eighty-nine billion, six hundred seventy-four million, four hundred forty thousand, seven hundred twenty".