21653051446620 has 72 divisors (see below), whose sum is σ = 71651915702640. Its totient is φ = 5249224592640.

The previous prime is 21653051446603. The next prime is 21653051446661. The reversal of 21653051446620 is 2664415035612.

21653051446620 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 3 + 0 + 5 + 14 + 4 + 6 + 620 = 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, 5467940305 + ... + 5467944264.

It is an arithmetic number, because the mean of its divisors is an integer number (995165495870).

Almost surely, 2^{21653051446620} is an apocalyptic number.

21653051446620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21653051446620 is an abundant number, since it is smaller than the sum of its proper divisors (49998864256020).

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

21653051446620 is a wasteful number, since it uses less digits than its factorization.

21653051446620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10935884595 (or 10935884590 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 21653051446620 in words is "twenty-one trillion, six hundred fifty-three billion, fifty-one million, four hundred forty-six thousand, six hundred twenty".