21796279 has 2 divisors, whose sum is σ = 21796280. Its totient is φ = 21796278.

The previous prime is 21796253. The next prime is 21796283. The reversal of 21796279 is 97269712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21796279 - 2²³ = 13407671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21796679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10898139 + 10898140.

It is an arithmetic number, because the mean of its divisors is an integer number (10898140).

Almost surely, 2^21796279 is an apocalyptic number.

21796279 is a deficient number, since it is larger than the sum of its proper divisors (1).

21796279 is an equidigital number, since it uses as much as digits as its factorization.

21796279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 43.

The square root of 21796279 is about 4668.6485196468. The cubic root of 21796279 is about 279.3363491883.

The spelling of 21796279 in words is "twenty-one million, seven hundred ninety-six thousand, two hundred seventy-nine".