21446615793 has 4 divisors (see below), whose sum is σ = 28595487728. Its totient is φ = 14297743860.

The previous prime is 21446615789. The next prime is 21446615797. The reversal of 21446615793 is 39751664412.

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 an interprime number because it is at equal distance from previous prime (21446615789) and next prime (21446615797).

It is not a de Polignac number, because 21446615793 - 2² = 21446615789 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21446615797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3574435963 + ... + 3574435968.

It is an arithmetic number, because the mean of its divisors is an integer number (7148871932).

Almost surely, 2^21446615793 is an apocalyptic number.

It is an amenable number.

21446615793 is a deficient number, since it is larger than the sum of its proper divisors (7148871935).

21446615793 is an equidigital number, since it uses as much as digits as its factorization.

21446615793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7148871934.

The product of its digits is 1088640, while the sum is 48.

The spelling of 21446615793 in words is "twenty-one billion, four hundred forty-six million, six hundred fifteen thousand, seven hundred ninety-three".