79721321451 has 16 divisors (see below), whose sum is σ = 106929987840. Its totient is φ = 52830219680.

The previous prime is 79721321447. The next prime is 79721321521. The reversal of 79721321451 is 15412312797.

It is a cyclic number.

It is not a de Polignac number, because 79721321451 - 2² = 79721321447 is a prime.

It is a super-3 number, since 3×79721321451³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (79721321431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3513220 + ... + 3535838.

It is an arithmetic number, because the mean of its divisors is an integer number (6683124240).

Almost surely, 2^79721321451 is an apocalyptic number.

79721321451 is a deficient number, since it is larger than the sum of its proper divisors (27208666389).

79721321451 is a wasteful number, since it uses less digits than its factorization.

79721321451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29586.

The product of its digits is 105840, while the sum is 42.

The spelling of 79721321451 in words is "seventy-nine billion, seven hundred twenty-one million, three hundred twenty-one thousand, four hundred fifty-one".