424202402021 has 2 divisors, whose sum is σ = 424202402022. Its totient is φ = 424202402020.

The previous prime is 424202402017. The next prime is 424202402087. The reversal of 424202402021 is 120204202424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 409393945921 + 14808456100 = 639839^2 + 121690^2 .

It is a cyclic number.

It is not a de Polignac number, because 424202402021 - 2² = 424202402017 is a prime.

It is a super-2 number, since 2×424202402021² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (424202402821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212101201010 + 212101201011.

It is an arithmetic number, because the mean of its divisors is an integer number (212101201011).

Almost surely, 2^424202402021 is an apocalyptic number.

It is an amenable number.

424202402021 is a deficient number, since it is larger than the sum of its proper divisors (1).

424202402021 is an equidigital number, since it uses as much as digits as its factorization.

424202402021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 424202402021 its reverse (120204202424), we get a palindrome (544406604445).

The spelling of 424202402021 in words is "four hundred twenty-four billion, two hundred two million, four hundred two thousand, twenty-one".