42021312989 has 2 divisors, whose sum is σ = 42021312990. Its totient is φ = 42021312988.

The previous prime is 42021312979. The next prime is 42021313003. The reversal of 42021312989 is 98921312024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42006552025 + 14760964 = 204955^2 + 3842^2 .

It is a cyclic number.

It is not a de Polignac number, because 42021312989 - 2²⁴ = 42004535773 is a prime.

It is a super-2 number, since 2×42021312989² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42021312919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21010656494 + 21010656495.

It is an arithmetic number, because the mean of its divisors is an integer number (21010656495).

Almost surely, 2^42021312989 is an apocalyptic number.

It is an amenable number.

42021312989 is a deficient number, since it is larger than the sum of its proper divisors (1).

42021312989 is an equidigital number, since it uses as much as digits as its factorization.

42021312989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 41.

The spelling of 42021312989 in words is "forty-two billion, twenty-one million, three hundred twelve thousand, nine hundred eighty-nine".