21160700221 has 4 divisors (see below), whose sum is σ = 21192811200. Its totient is φ = 21128589244.

The previous prime is 21160700213. The next prime is 21160700237. The reversal of 21160700221 is 12200706112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21160700221 - 2³ = 21160700213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21160700192 and 21160700201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21160740221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16054501 + ... + 16055818.

It is an arithmetic number, because the mean of its divisors is an integer number (5298202800).

Almost surely, 2^21160700221 is an apocalyptic number.

It is an amenable number.

21160700221 is a deficient number, since it is larger than the sum of its proper divisors (32110979).

21160700221 is an equidigital number, since it uses as much as digits as its factorization.

21160700221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32110978.

The product of its (nonzero) digits is 336, while the sum is 22.

The spelling of 21160700221 in words is "twenty-one billion, one hundred sixty million, seven hundred thousand, two hundred twenty-one".