202112021 has 4 divisors (see below), whose sum is σ = 203228844. Its totient is φ = 200995200.

The previous prime is 202112003. The next prime is 202112039. The reversal of 202112021 is 120211202.

It is a happy number.

202112021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (202112003) and next prime (202112039).

It can be written as a sum of positive squares in 2 ways, for example, as 2907025 + 199204996 = 1705^2 + 14114^2 .

It is a cyclic number.

It is not a de Polignac number, because 202112021 - 2¹⁸ = 201849877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202111993 and 202112011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202112321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558140 + ... + 558501.

It is an arithmetic number, because the mean of its divisors is an integer number (50807211).

Almost surely, 2^202112021 is an apocalyptic number.

It is an amenable number.

202112021 is a deficient number, since it is larger than the sum of its proper divisors (1116823).

202112021 is a wasteful number, since it uses less digits than its factorization.

202112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116822.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 202112021 is about 14216.6107423675. The cubic root of 202112021 is about 586.8548727183.

Adding to 202112021 its reverse (120211202), we get a palindrome (322323223).

The spelling of 202112021 in words is "two hundred two million, one hundred twelve thousand, twenty-one".