100021320391 has 2 divisors, whose sum is σ = 100021320392. Its totient is φ = 100021320390.

The previous prime is 100021320317. The next prime is 100021320409. The reversal of 100021320391 is 193023120001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 100021320391 - 2⁷ = 100021320263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100021320691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50010660195 + 50010660196.

It is an arithmetic number, because the mean of its divisors is an integer number (50010660196).

Almost surely, 2^100021320391 is an apocalyptic number.

100021320391 is a deficient number, since it is larger than the sum of its proper divisors (1).

100021320391 is an equidigital number, since it uses as much as digits as its factorization.

100021320391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 100021320391 its reverse (193023120001), we get a palindrome (293044440392).

The spelling of 100021320391 in words is "one hundred billion, twenty-one million, three hundred twenty thousand, three hundred ninety-one".