202116921 has 16 divisors (see below), whose sum is σ = 285586560. Its totient is φ = 126922880.

The previous prime is 202116913. The next prime is 202116947. The reversal of 202116921 is 129611202.

It is not a de Polignac number, because 202116921 - 2³ = 202116913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202116891 and 202116900.

It is not an unprimeable number, because it can be changed into a prime (202116911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24765 + ... + 31898.

It is an arithmetic number, because the mean of its divisors is an integer number (17849160).

Almost surely, 2^202116921 is an apocalyptic number.

It is an amenable number.

202116921 is a deficient number, since it is larger than the sum of its proper divisors (83469639).

202116921 is a wasteful number, since it uses less digits than its factorization.

202116921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56736.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 202116921 is about 14216.7830749435. The cubic root of 202116921 is about 586.8596152461.

The spelling of 202116921 in words is "two hundred two million, one hundred sixteen thousand, nine hundred twenty-one".