202031021 has 4 divisors (see below), whose sum is σ = 202346844. Its totient is φ = 201715200.

The previous prime is 202031003. The next prime is 202031033. The reversal of 202031021 is 120130202.

It is a happy number.

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 167055625 + 34975396 = 12925^2 + 5914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202031021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202030993 and 202031011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202031321) 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, 156950 + ... + 158231.

It is an arithmetic number, because the mean of its divisors is an integer number (50586711).

Almost surely, 2^202031021 is an apocalyptic number.

It is an amenable number.

202031021 is a deficient number, since it is larger than the sum of its proper divisors (315823).

202031021 is an equidigital number, since it uses as much as digits as its factorization.

202031021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315822.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 202031021 is about 14213.7616766287. The cubic root of 202031021 is about 586.7764647211.

Adding to 202031021 its reverse (120130202), we get a palindrome (322161223).

The spelling of 202031021 in words is "two hundred two million, thirty-one thousand, twenty-one".