21070773730440 has 192 divisors, whose sum is σ = 78604635283200. Its totient is φ = 4795145381376.

The previous prime is 21070773730427. The next prime is 21070773730453. The reversal of 21070773730440 is 4403737707012.

21070773730440 is a `hidden beast` number, since 2 + 1 + 0 + 70 + 7 + 73 + 73 + 0 + 440 = 666.

It is an interprime number because it is at equal distance from previous prime (21070773730427) and next prime (21070773730453).

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

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, 17679292 + ... + 18833451.

It is an arithmetic number, because the mean of its divisors is an integer number (409399142100).

Almost surely, 2^{21070773730440} is an apocalyptic number.

21070773730440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21070773730440 is an abundant number, since it is smaller than the sum of its proper divisors (57533861552760).

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

21070773730440 is a wasteful number, since it uses less digits than its factorization.

21070773730440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36512996 (or 36512989 counting only the distinct ones).

The product of its (nonzero) digits is 691488, while the sum is 45.

The spelling of 21070773730440 in words is "twenty-one trillion, seventy billion, seven hundred seventy-three million, seven hundred thirty thousand, four hundred forty".