202155221 has 2 divisors, whose sum is σ = 202155222. Its totient is φ = 202155220.

The previous prime is 202155167. The next prime is 202155251. The reversal of 202155221 is 122551202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193071025 + 9084196 = 13895^2 + 3014^2 .

It is a cyclic number.

It is not a de Polignac number, because 202155221 - 2⁶ = 202155157 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 202155193 and 202155202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202155251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101077610 + 101077611.

It is an arithmetic number, because the mean of its divisors is an integer number (101077611).

Almost surely, 2^202155221 is an apocalyptic number.

It is an amenable number.

202155221 is a deficient number, since it is larger than the sum of its proper divisors (1).

202155221 is an equidigital number, since it uses as much as digits as its factorization.

202155221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 202155221 is about 14218.1300106589. The cubic root of 202155221 is about 586.8966817512.

The spelling of 202155221 in words is "two hundred two million, one hundred fifty-five thousand, two hundred twenty-one".