21227165317 has 8 divisors (see below), whose sum is σ = 21589783200. Its totient is φ = 20864642064.

The previous prime is 21227165303. The next prime is 21227165329. The reversal of 21227165317 is 71356172212.

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 21227165317 - 2³¹ = 19079681669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21227165017) 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, 543943 + ... + 581659.

It is an arithmetic number, because the mean of its divisors is an integer number (2698722900).

Almost surely, 2^21227165317 is an apocalyptic number.

It is an amenable number.

21227165317 is a deficient number, since it is larger than the sum of its proper divisors (362617883).

21227165317 is an equidigital number, since it uses as much as digits as its factorization.

21227165317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47315.

The product of its digits is 35280, while the sum is 37.

The spelling of 21227165317 in words is "twenty-one billion, two hundred twenty-seven million, one hundred sixty-five thousand, three hundred seventeen".