202004021 has 2 divisors, whose sum is σ = 202004022. Its totient is φ = 202004020.

The previous prime is 202004003. The next prime is 202004051. The reversal of 202004021 is 120400202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127803025 + 74200996 = 11305^2 + 8614^2 .

It is a cyclic number.

It is not a de Polignac number, because 202004021 - 2¹⁴ = 201987637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202003993 and 202004011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202004051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101002010 + 101002011.

It is an arithmetic number, because the mean of its divisors is an integer number (101002011).

Almost surely, 2^202004021 is an apocalyptic number.

It is an amenable number.

202004021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202004021 is an equidigital number, since it uses as much as digits as its factorization.

202004021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 202004021 is about 14212.8118611343. The cubic root of 202004021 is about 586.7503240650.

Adding to 202004021 its reverse (120400202), we get a palindrome (322404223).

The spelling of 202004021 in words is "two hundred two million, four thousand, twenty-one".