21795079 has 2 divisors, whose sum is σ = 21795080. Its totient is φ = 21795078.

The previous prime is 21795043. The next prime is 21795113. The reversal of 21795079 is 97059712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21795079 - 2¹⁵ = 21762311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21795019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10897539 + 10897540.

It is an arithmetic number, because the mean of its divisors is an integer number (10897540).

Almost surely, 2^21795079 is an apocalyptic number.

21795079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21795079 is an equidigital number, since it uses as much as digits as its factorization.

21795079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 21795079 is about 4668.5200010282. The cubic root of 21795079 is about 279.3312227816.

The spelling of 21795079 in words is "twenty-one million, seven hundred ninety-five thousand, seventy-nine".