307933391021 has 2 divisors, whose sum is σ = 307933391022. Its totient is φ = 307933391020.

The previous prime is 307933390991. The next prime is 307933391047. The reversal of 307933391021 is 120193339703.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209283375625 + 98650015396 = 457475^2 + 314086^2 .

It is an emirp because it is prime and its reverse (120193339703) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 307933391021 - 2⁶ = 307933390957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 307933391021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (307933391081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153966695510 + 153966695511.

It is an arithmetic number, because the mean of its divisors is an integer number (153966695511).

Almost surely, 2^307933391021 is an apocalyptic number.

It is an amenable number.

307933391021 is a deficient number, since it is larger than the sum of its proper divisors (1).

307933391021 is an equidigital number, since it uses as much as digits as its factorization.

307933391021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 91854, while the sum is 41.

The spelling of 307933391021 in words is "three hundred seven billion, nine hundred thirty-three million, three hundred ninety-one thousand, twenty-one".