21909286320433 has 8 divisors (see below), whose sum is σ = 21933154305608. Its totient is φ = 21885419372544.

The previous prime is 21909286320421. The next prime is 21909286320443. The reversal of 21909286320433 is 33402368290912.

It can be written as a sum of positive squares in 4 ways, for example, as 3407003481249 + 18502282839184 = 1845807^2 + 4301428^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21909286320433 - 2³⁷ = 21771847366961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21909286320443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46609585 + ... + 47077297.

It is an arithmetic number, because the mean of its divisors is an integer number (2741644288201).

Almost surely, 2^{21909286320433} is an apocalyptic number.

It is an amenable number.

21909286320433 is a deficient number, since it is larger than the sum of its proper divisors (23867985175).

21909286320433 is an equidigital number, since it uses as much as digits as its factorization.

21909286320433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518643.

The product of its (nonzero) digits is 3359232, while the sum is 52.

The spelling of 21909286320433 in words is "twenty-one trillion, nine hundred nine billion, two hundred eighty-six million, three hundred twenty thousand, four hundred thirty-three".