320040215021 has 2 divisors, whose sum is σ = 320040215022. Its totient is φ = 320040215020.

The previous prime is 320040214997. The next prime is 320040215039. The reversal of 320040215021 is 120512040023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165111382921 + 154928832100 = 406339^2 + 393610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320040215021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320040214984 and 320040215002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320040215071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160020107510 + 160020107511.

It is an arithmetic number, because the mean of its divisors is an integer number (160020107511).

Almost surely, 2^320040215021 is an apocalyptic number.

It is an amenable number.

320040215021 is a deficient number, since it is larger than the sum of its proper divisors (1).

320040215021 is an equidigital number, since it uses as much as digits as its factorization.

320040215021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 320040215021 its reverse (120512040023), we get a palindrome (440552255044).

The spelling of 320040215021 in words is "three hundred twenty billion, forty million, two hundred fifteen thousand, twenty-one".