42021340993 has 2 divisors, whose sum is σ = 42021340994. Its totient is φ = 42021340992.

The previous prime is 42021340973. The next prime is 42021341017. The reversal of 42021340993 is 39904312024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41448073744 + 573267249 = 203588^2 + 23943^2 .

It is a cyclic number.

It is not a de Polignac number, because 42021340993 - 2⁵ = 42021340961 is a prime.

It is not a weakly prime, because it can be changed into another prime (42021340913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21010670496 + 21010670497.

It is an arithmetic number, because the mean of its divisors is an integer number (21010670497).

Almost surely, 2^42021340993 is an apocalyptic number.

It is an amenable number.

42021340993 is a deficient number, since it is larger than the sum of its proper divisors (1).

42021340993 is an equidigital number, since it uses as much as digits as its factorization.

42021340993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 37.

The spelling of 42021340993 in words is "forty-two billion, twenty-one million, three hundred forty thousand, nine hundred ninety-three".