2022172921 has 2 divisors, whose sum is σ = 2022172922. Its totient is φ = 2022172920.

The previous prime is 2022172897. The next prime is 2022172937. The reversal of 2022172921 is 1292712202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1131986025 + 890186896 = 33645^2 + 29836^2 .

It is a cyclic number.

It is not a de Polignac number, because 2022172921 - 2¹¹ = 2022170873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2022172921.

It is not a weakly prime, because it can be changed into another prime (2022172961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1011086460 + 1011086461.

It is an arithmetic number, because the mean of its divisors is an integer number (1011086461).

Almost surely, 2^2022172921 is an apocalyptic number.

It is an amenable number.

2022172921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2022172921 is an equidigital number, since it uses as much as digits as its factorization.

2022172921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 2022172921 is about 44968.5770399731. The cubic root of 2022172921 is about 1264.5599704780.

The spelling of 2022172921 in words is "two billion, twenty-two million, one hundred seventy-two thousand, nine hundred twenty-one".