390475570021 has 4 divisors (see below), whose sum is σ = 392095800844. Its totient is φ = 388855339200.

The previous prime is 390475570013. The next prime is 390475570027. The reversal of 390475570021 is 120075574093.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 203234164225 + 187241405796 = 450815^2 + 432714^2 .

It is a cyclic number.

It is not a de Polignac number, because 390475570021 - 2³ = 390475570013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 390475570021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390475570027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 810115050 + ... + 810115531.

It is an arithmetic number, because the mean of its divisors is an integer number (98023950211).

Almost surely, 2^390475570021 is an apocalyptic number.

It is an amenable number.

390475570021 is a deficient number, since it is larger than the sum of its proper divisors (1620230823).

390475570021 is a wasteful number, since it uses less digits than its factorization.

390475570021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620230822.

The product of its (nonzero) digits is 264600, while the sum is 43.

The spelling of 390475570021 in words is "three hundred ninety billion, four hundred seventy-five million, five hundred seventy thousand, twenty-one".