21653051446560 has 96 divisors (see below), whose sum is σ = 68227593561792. Its totient is φ = 5772413168640.

The previous prime is 21653051446547. The next prime is 21653051446577. The reversal of 21653051446560 is 6564415035612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5172439 + ... + 8370198.

It is an arithmetic number, because the mean of its divisors is an integer number (710704099602).

Almost surely, 2^{21653051446560} is an apocalyptic number.

21653051446560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21653051446560 is an abundant number, since it is smaller than the sum of its proper divisors (46574542115232).

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

21653051446560 is a wasteful number, since it uses less digits than its factorization.

21653051446560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13545986 (or 13545978 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 48.

The spelling of 21653051446560 in words is "twenty-one trillion, six hundred fifty-three billion, fifty-one million, four hundred forty-six thousand, five hundred sixty".