202016921 has 2 divisors, whose sum is σ = 202016922. Its totient is φ = 202016920.

The previous prime is 202016909. The next prime is 202016989. The reversal of 202016921 is 129610202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113656921 + 88360000 = 10661^2 + 9400^2 .

It is a cyclic number.

It is not a de Polignac number, because 202016921 - 2¹⁴ = 202000537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (202016621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101008460 + 101008461.

It is an arithmetic number, because the mean of its divisors is an integer number (101008461).

Almost surely, 2^202016921 is an apocalyptic number.

It is an amenable number.

202016921 is a deficient number, since it is larger than the sum of its proper divisors (1).

202016921 is an equidigital number, since it uses as much as digits as its factorization.

202016921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 202016921 is about 14213.2656697889. The cubic root of 202016921 is about 586.7628137801.

The spelling of 202016921 in words is "two hundred two million, sixteen thousand, nine hundred twenty-one".