220195921 has 27 divisors (see below), whose sum is σ = 259091049. Its totient is φ = 186971400.

The previous prime is 220195919. The next prime is 220195931. The reversal of 220195921 is 129591022.

The square root of 220195921 is 14839.

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

It is not a de Polignac number, because 220195921 - 2¹ = 220195919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220195931) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3101316 + ... + 3101386.

Almost surely, 2^220195921 is an apocalyptic number.

220195921 is the 14839-th square number.

220195921 is the 7420-th centered octagonal number.

It is an amenable number.

220195921 is a deficient number, since it is larger than the sum of its proper divisors (38895128).

220195921 is an equidigital number, since it uses as much as digits as its factorization.

220195921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 31.

The cubic root of 220195921 is about 603.8602232365.

The spelling of 220195921 in words is "two hundred twenty million, one hundred ninety-five thousand, nine hundred twenty-one".