22305721201 has 3 divisors (see below), whose sum is σ = 22305870553. Its totient is φ = 22305571850.

The previous prime is 22305721187. The next prime is 22305721237. The reversal of 22305721201 is 10212750322.

The square root of 22305721201 is 149351.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 22305721201 - 2¹¹ = 22305719153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22305721001) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 74676 + ... + 224026.

Almost surely, 2^22305721201 is an apocalyptic number.

22305721201 is the 149351-st square number.

22305721201 is the 74676-th centered octagonal number.

It is an amenable number.

22305721201 is a deficient number, since it is larger than the sum of its proper divisors (149352).

22305721201 is an frugal number, since it uses more digits than its factorization.

22305721201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298702 (or 149351 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

Multiplying 22305721201 by its sum of digits (25), we get a square (557643030025 = 746755²).

The spelling of 22305721201 in words is "twenty-two billion, three hundred five million, seven hundred twenty-one thousand, two hundred one".