79722421 has 16 divisors (see below), whose sum is σ = 86400000. Its totient is φ = 73382400.

The previous prime is 79722407. The next prime is 79722427. The reversal of 79722421 is 12422797.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 79722421 - 2¹¹ = 79720373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79722427) 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, 63205 + ... + 64453.

It is an arithmetic number, because the mean of its divisors is an integer number (5400000).

Almost surely, 2^79722421 is an apocalyptic number.

79722421 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

79722421 is a deficient number, since it is larger than the sum of its proper divisors (6677579).

79722421 is a wasteful number, since it uses less digits than its factorization.

79722421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380.

The product of its digits is 14112, while the sum is 34.

The square root of 79722421 is about 8928.7412886700. The cubic root of 79722421 is about 430.3880056502.

It can be divided in two parts, 79 and 722421, that added together give a square (722500 = 850²).

The spelling of 79722421 in words is "seventy-nine million, seven hundred twenty-two thousand, four hundred twenty-one".