202421321 has 6 divisors (see below), whose sum is σ = 211605450. Its totient is φ = 193619888.

The previous prime is 202421309. The next prime is 202421353. The reversal of 202421321 is 123124202.

It can be written as a sum of positive squares in only one way, i.e., 170668096 + 31753225 = 13064^2 + 5635^2 .

It is a de Polignac number, because none of the positive numbers 2^k-202421321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 202421321.

It is not an unprimeable number, because it can be changed into a prime (202421221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 190796 + ... + 191853.

It is an arithmetic number, because the mean of its divisors is an integer number (35267575).

Almost surely, 2^202421321 is an apocalyptic number.

It is an amenable number.

202421321 is a deficient number, since it is larger than the sum of its proper divisors (9184129).

202421321 is an equidigital number, since it uses as much as digits as its factorization.

202421321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382695 (or 382672 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 202421321 is about 14227.4847039102. The cubic root of 202421321 is about 587.1540825279.

Adding to 202421321 its reverse (123124202), we get a palindrome (325545523).

The spelling of 202421321 in words is "two hundred two million, four hundred twenty-one thousand, three hundred twenty-one".