202210021 has 6 divisors (see below), whose sum is σ = 218961330. Its totient is φ = 186655248.

The previous prime is 202209971. The next prime is 202210033. The reversal of 202210021 is 120012202.

It can be written as a sum of positive squares in 3 ways, for example, as 172225 + 202037796 = 415^2 + 14214^2 .

It is not a de Polignac number, because 202210021 - 2¹⁵ = 202177253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202210081) 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, 598086 + ... + 598423.

It is an arithmetic number, because the mean of its divisors is an integer number (36493555).

Almost surely, 2^202210021 is an apocalyptic number.

It is an amenable number.

202210021 is a deficient number, since it is larger than the sum of its proper divisors (16751309).

202210021 is a wasteful number, since it uses less digits than its factorization.

202210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196535 (or 1196522 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 202210021 is about 14220.0569970728. The cubic root of 202210021 is about 586.9497087145.

Adding to 202210021 its reverse (120012202), we get a palindrome (322222223).

The spelling of 202210021 in words is "two hundred two million, two hundred ten thousand, twenty-one".