202002042421 has 2 divisors, whose sum is σ = 202002042422. Its totient is φ = 202002042420.

The previous prime is 202002042367. The next prime is 202002042439. The reversal of 202002042421 is 124240200202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201164808196 + 837234225 = 448514^2 + 28935^2 .

It is a cyclic number.

It is not a de Polignac number, because 202002042421 - 2³⁷ = 64563088949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202002042461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101001021210 + 101001021211.

It is an arithmetic number, because the mean of its divisors is an integer number (101001021211).

Almost surely, 2^202002042421 is an apocalyptic number.

It is an amenable number.

202002042421 is a deficient number, since it is larger than the sum of its proper divisors (1).

202002042421 is an equidigital number, since it uses as much as digits as its factorization.

202002042421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 202002042421 its reverse (124240200202), we get a palindrome (326242242623).

The spelling of 202002042421 in words is "two hundred two billion, two million, forty-two thousand, four hundred twenty-one".