20331001399 has 2 divisors, whose sum is σ = 20331001400. Its totient is φ = 20331001398.

The previous prime is 20331001387. The next prime is 20331001451. The reversal of 20331001399 is 99310013302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20331001399 - 2¹⁷ = 20330870327 is a prime.

It is a super-2 number, since 2×20331001399² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20331001399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20331001349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165500699 + 10165500700.

It is an arithmetic number, because the mean of its divisors is an integer number (10165500700).

Almost surely, 2^20331001399 is an apocalyptic number.

20331001399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331001399 is an equidigital number, since it uses as much as digits as its factorization.

20331001399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 31.

The spelling of 20331001399 in words is "twenty billion, three hundred thirty-one million, one thousand, three hundred ninety-nine".