402210185021 has 2 divisors, whose sum is σ = 402210185022. Its totient is φ = 402210185020.

The previous prime is 402210185011. The next prime is 402210185023. The reversal of 402210185021 is 120581012204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 357514305625 + 44695879396 = 597925^2 + 211414^2 .

It is a cyclic number.

It is not a de Polignac number, because 402210185021 - 2¹⁰ = 402210183997 is a prime.

Together with 402210185023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402210185023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201105092510 + 201105092511.

It is an arithmetic number, because the mean of its divisors is an integer number (201105092511).

Almost surely, 2^402210185021 is an apocalyptic number.

It is an amenable number.

402210185021 is a deficient number, since it is larger than the sum of its proper divisors (1).

402210185021 is an equidigital number, since it uses as much as digits as its factorization.

402210185021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 26.

Adding to 402210185021 its reverse (120581012204), we get a palindrome (522791197225).

The spelling of 402210185021 in words is "four hundred two billion, two hundred ten million, one hundred eighty-five thousand, twenty-one".