22721237165 has 16 divisors (see below), whose sum is σ = 29748185280. Its totient is φ = 16522302720.

The previous prime is 22721237089. The next prime is 22721237219. The reversal of 22721237165 is 56173212722.

It is not a de Polignac number, because 22721237165 - 2²² = 22717042861 is a prime.

It is a congruent number.

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, 459317 + ... + 506373.

It is an arithmetic number, because the mean of its divisors is an integer number (1859261580).

Almost surely, 2^22721237165 is an apocalyptic number.

It is an amenable number.

22721237165 is a deficient number, since it is larger than the sum of its proper divisors (7026948115).

22721237165 is a wasteful number, since it uses less digits than its factorization.

22721237165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55852.

The product of its digits is 70560, while the sum is 38.

Adding to 22721237165 its reverse (56173212722), we get a palindrome (78894449887).

The spelling of 22721237165 in words is "twenty-two billion, seven hundred twenty-one million, two hundred thirty-seven thousand, one hundred sixty-five".