79433221921 has 3 divisors (see below), whose sum is σ = 79433503761. Its totient is φ = 79432940082.

The previous prime is 79433221873. The next prime is 79433221927. The reversal of 79433221921 is 12912233497.

The square root of 79433221921 is 281839.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12912233497 = 27397 ⋅471301.

It is not a de Polignac number, because 79433221921 - 2⁷ = 79433221793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79433221927) 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 2 ways as a sum of consecutive naturals, for example, 140920 + ... + 422758.

It is an arithmetic number, because the mean of its divisors is an integer number (26477834587).

Almost surely, 2^79433221921 is an apocalyptic number.

79433221921 is the 281839-th square number.

79433221921 is the 140920-th centered octagonal number.

It is an amenable number.

79433221921 is a deficient number, since it is larger than the sum of its proper divisors (281840).

79433221921 is an frugal number, since it uses more digits than its factorization.

79433221921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563678 (or 281839 counting only the distinct ones).

The product of its digits is 163296, while the sum is 43.

The spelling of 79433221921 in words is "seventy-nine billion, four hundred thirty-three million, two hundred twenty-one thousand, nine hundred twenty-one".