21222537593 has 8 divisors (see below), whose sum is σ = 21646304160. Its totient is φ = 20800906560.

The previous prime is 21222537587. The next prime is 21222537613. The reversal of 21222537593 is 39573522212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222537593 is a prime.

It is a super-2 number, since 2×21222537593² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21222537593.

It is not an unprimeable number, because it can be changed into a prime (21222539593) 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, 513803 + ... + 553568.

It is an arithmetic number, because the mean of its divisors is an integer number (2705788020).

Almost surely, 2^21222537593 is an apocalyptic number.

It is an amenable number.

21222537593 is a deficient number, since it is larger than the sum of its proper divisors (423766567).

21222537593 is a wasteful number, since it uses less digits than its factorization.

21222537593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067767.

The product of its digits is 226800, while the sum is 41.

The spelling of 21222537593 in words is "twenty-one billion, two hundred twenty-two million, five hundred thirty-seven thousand, five hundred ninety-three".