22698736921 has 9 divisors (see below), whose sum is σ = 26405880021. Its totient is φ = 19455156252.

The previous prime is 22698736891. The next prime is 22698736927. The reversal of 22698736921 is 12963789622.

The square root of 22698736921 is 150661.

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

It is not a de Polignac number, because 22698736921 - 2¹¹ = 22698734873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22698736927) 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, 1043866 + ... + 1065388.

It is an arithmetic number, because the mean of its divisors is an integer number (2933986669).

Almost surely, 2^22698736921 is an apocalyptic number.

22698736921 is the 150661-st square number.

22698736921 is the 75331-st centered octagonal number.

It is an amenable number.

22698736921 is a deficient number, since it is larger than the sum of its proper divisors (3707143100).

22698736921 is an frugal number, since it uses more digits than its factorization.

22698736921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43060 (or 21530 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 55.

The spelling of 22698736921 in words is "twenty-two billion, six hundred ninety-eight million, seven hundred thirty-six thousand, nine hundred twenty-one".