21657060655051 has 8 divisors (see below), whose sum is σ = 21875656615344. Its totient is φ = 21438937336320.

The previous prime is 21657060655031. The next prime is 21657060655073. The reversal of 21657060655051 is 15055606075612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21657060655051 - 2⁷ = 21657060654923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21657060654986 and 21657060655004.

It is not an unprimeable number, because it can be changed into a prime (21657060655031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118068286 + ... + 118251571.

It is an arithmetic number, because the mean of its divisors is an integer number (2734457076918).

Almost surely, 2^{21657060655051} is an apocalyptic number.

21657060655051 is a deficient number, since it is larger than the sum of its proper divisors (218595960293).

21657060655051 is a wasteful number, since it uses less digits than its factorization.

21657060655051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236320781.

The product of its (nonzero) digits is 1890000, while the sum is 49.

The spelling of 21657060655051 in words is "twenty-one trillion, six hundred fifty-seven billion, sixty million, six hundred fifty-five thousand, fifty-one".