21329962787 has 12 divisors (see below), whose sum is σ = 25232958360. Its totient is φ = 17972944416.

The previous prime is 21329962769. The next prime is 21329962813. The reversal of 21329962787 is 78726992312.

It is not a de Polignac number, because 21329962787 - 2²⁶ = 21262853923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21329962487) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3686138 + ... + 3691919.

It is an arithmetic number, because the mean of its divisors is an integer number (2102746530).

Almost surely, 2^21329962787 is an apocalyptic number.

21329962787 is a deficient number, since it is larger than the sum of its proper divisors (3902995573).

21329962787 is an equidigital number, since it uses as much as digits as its factorization.

21329962787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7378130 (or 7378123 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 56.

The spelling of 21329962787 in words is "twenty-one billion, three hundred twenty-nine million, nine hundred sixty-two thousand, seven hundred eighty-seven".