21966079 has 6 divisors (see below), whose sum is σ = 22750520. Its totient is φ = 21207816.

The previous prime is 21966067. The next prime is 21966097. The reversal of 21966079 is 97066912.

It is not a de Polignac number, because 21966079 - 2¹¹ = 21964031 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 (21966019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12219 + ... + 13900.

Almost surely, 2^21966079 is an apocalyptic number.

21966079 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21966079 is a deficient number, since it is larger than the sum of its proper divisors (784441).

21966079 is an equidigital number, since it uses as much as digits as its factorization.

21966079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26177 (or 26148 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 21966079 is about 4686.7983741569. The cubic root of 21966079 is about 280.0598469014.

The spelling of 21966079 in words is "twenty-one million, nine hundred sixty-six thousand, seventy-nine".