202402021 has 2 divisors, whose sum is σ = 202402022. Its totient is φ = 202402020.

The previous prime is 202402009. The next prime is 202402027. The reversal of 202402021 is 120204202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122102500 + 80299521 = 11050^2 + 8961^2 .

It is a cyclic number.

It is not a de Polignac number, because 202402021 - 2²¹ = 200304869 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 202401992 and 202402010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202402027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101201010 + 101201011.

It is an arithmetic number, because the mean of its divisors is an integer number (101201011).

Almost surely, 2^202402021 is an apocalyptic number.

It is an amenable number.

202402021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202402021 is an equidigital number, since it uses as much as digits as its factorization.

202402021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 202402021 is about 14226.8064230874. The cubic root of 202402021 is about 587.1354210649.

Adding to 202402021 its reverse (120204202), we get a palindrome (322606223).

The spelling of 202402021 in words is "two hundred two million, four hundred two thousand, twenty-one".