202542021 has 36 divisors (see below), whose sum is σ = 326953900. Its totient is φ = 120700800.

The previous prime is 202541993. The next prime is 202542031. The reversal of 202542021 is 120245202.

It can be written as a sum of positive squares in 2 ways, for example, as 13176900 + 189365121 = 3630^2 + 13761^2 .

It is not a de Polignac number, because 202542021 - 2¹⁹ = 202017733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202541985 and 202542003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202542031) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 64905 + ... + 67953.

Almost surely, 2^202542021 is an apocalyptic number.

It is an amenable number.

202542021 is a deficient number, since it is larger than the sum of its proper divisors (124411879).

202542021 is a wasteful number, since it uses less digits than its factorization.

202542021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138 (or 3124 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 202542021 is about 14231.7258616093. The cubic root of 202542021 is about 587.2707622927.

Adding to 202542021 its reverse (120245202), we get a palindrome (322787223).

The spelling of 202542021 in words is "two hundred two million, five hundred forty-two thousand, twenty-one".