185222872534921 has 9 divisors (see below), whose sum is σ = 200566970717781. Its totient is φ = 170974795947072.

The previous prime is 185222872534829. The next prime is 185222872534927. The reversal of 185222872534921 is 129435278222581.

The square root of 185222872534921 is 13609661.

It is a perfect power (a square), and thus also a powerful number.

185222872534921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4569380787321 + 180653491747600 = 2137611^2 + 13440740^2 .

It is not a de Polignac number, because 185222872534921 - 2⁷ = 185222872534793 is a prime.

It is a super-2 number, since 2×185222872534921² (a number of 29 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 185222872534921.

It is not an unprimeable number, because it can be changed into a prime (185222872534927) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 176402145 + ... + 177449041.

Almost surely, 2^{185222872534921} is an apocalyptic number.

185222872534921 is the 13609661-st square number.

185222872534921 is the 6804831-st centered octagonal number.

It is an amenable number.

185222872534921 is a deficient number, since it is larger than the sum of its proper divisors (15344098182860).

185222872534921 is an frugal number, since it uses more digits than its factorization.

185222872534921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093820 (or 1046910 counting only the distinct ones).

The product of its digits is 38707200, while the sum is 61.

The spelling of 185222872534921 in words is "one hundred eighty-five trillion, two hundred twenty-two billion, eight hundred seventy-two million, five hundred thirty-four thousand, nine hundred twenty-one".