202213421 has 4 divisors (see below), whose sum is σ = 204068700. Its totient is φ = 200358144.

The previous prime is 202213393. The next prime is 202213439. The reversal of 202213421 is 124312202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 158508100 + 43705321 = 12590^2 + 6611^2 .

It is a cyclic number.

It is not a de Polignac number, because 202213421 - 2¹⁰ = 202212397 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 202213421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202213021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 927476 + ... + 927693.

It is an arithmetic number, because the mean of its divisors is an integer number (51017175).

Almost surely, 2^202213421 is an apocalyptic number.

It is an amenable number.

202213421 is a deficient number, since it is larger than the sum of its proper divisors (1855279).

202213421 is a wasteful number, since it uses less digits than its factorization.

202213421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1855278.

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

The square root of 202213421 is about 14220.1765460208. The cubic root of 202213421 is about 586.9529983930.

Adding to 202213421 its reverse (124312202), we get a palindrome (326525623).

The spelling of 202213421 in words is "two hundred two million, two hundred thirteen thousand, four hundred twenty-one".