2173150653921 has 27 divisors (see below), whose sum is σ = 3399120436179. Its totient is φ = 1337288099472.

The previous prime is 2173150653911. The next prime is 2173150653937. The reversal of 2173150653921 is 1293560513712.

The square root of 2173150653921 is 1474161.

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

2173150653921 is a `hidden beast` number, since 2 + 1 + 7 + 3 + 1 + 506 + 53 + 92 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 321471990225 + 1851678663696 = 566985^2 + 1360764^2 .

It is not a de Polignac number, because 2173150653921 - 2¹⁵ = 2173150621153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2173150653901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 57473380 + ... + 57511178.

Almost surely, 2^{2173150653921} is an apocalyptic number.

2173150653921 is the 1474161-st square number.

2173150653921 is the 737081-st centered octagonal number.

It is an amenable number.

2173150653921 is a deficient number, since it is larger than the sum of its proper divisors (1225969782258).

2173150653921 is an frugal number, since it uses more digits than its factorization.

2173150653921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75630 (or 37815 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The spelling of 2173150653921 in words is "two trillion, one hundred seventy-three billion, one hundred fifty million, six hundred fifty-three thousand, nine hundred twenty-one".