21160644753 has 16 divisors (see below), whose sum is σ = 29885328000. Its totient is φ = 13272166656.

The previous prime is 21160644737. The next prime is 21160644779. The reversal of 21160644753 is 35744606112.

It is a happy number.

It is not a de Polignac number, because 21160644753 - 2⁴ = 21160644737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21160644053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56623 + ... + 213371.

It is an arithmetic number, because the mean of its divisors is an integer number (1867833000).

Almost surely, 2^21160644753 is an apocalyptic number.

It is an amenable number.

21160644753 is a deficient number, since it is larger than the sum of its proper divisors (8724683247).

21160644753 is a wasteful number, since it uses less digits than its factorization.

21160644753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159416.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 21160644753 in words is "twenty-one billion, one hundred sixty million, six hundred forty-four thousand, seven hundred fifty-three".