202021139 has 2 divisors, whose sum is σ = 202021140. Its totient is φ = 202021138.

The previous prime is 202021117. The next prime is 202021151. The reversal of 202021139 is 931120202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 202021139 - 2¹⁶ = 201955603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202021139.

It is not a weakly prime, because it can be changed into another prime (202021639) 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, 101010569 + 101010570.

It is an arithmetic number, because the mean of its divisors is an integer number (101010570).

Almost surely, 2^202021139 is an apocalyptic number.

202021139 is a deficient number, since it is larger than the sum of its proper divisors (1).

202021139 is an equidigital number, since it uses as much as digits as its factorization.

202021139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 202021139 is about 14213.4140515219. The cubic root of 202021139 is about 586.7668975112.

The spelling of 202021139 in words is "two hundred two million, twenty-one thousand, one hundred thirty-nine".