21293591329 has 4 divisors (see below), whose sum is σ = 21298851760. Its totient is φ = 21288330900.

The previous prime is 21293591299. The next prime is 21293591351. The reversal of 21293591329 is 92319539212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21293591329 - 2²³ = 21285202721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21293591129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2624139 + ... + 2632240.

It is an arithmetic number, because the mean of its divisors is an integer number (5324712940).

Almost surely, 2^21293591329 is an apocalyptic number.

It is an amenable number.

21293591329 is a deficient number, since it is larger than the sum of its proper divisors (5260431).

21293591329 is an equidigital number, since it uses as much as digits as its factorization.

21293591329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5260430.

The product of its digits is 262440, while the sum is 46.

The spelling of 21293591329 in words is "twenty-one billion, two hundred ninety-three million, five hundred ninety-one thousand, three hundred twenty-nine".