21106079 has 2 divisors, whose sum is σ = 21106080. Its totient is φ = 21106078.

The previous prime is 21106067. The next prime is 21106087. The reversal of 21106079 is 97060112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21106079 - 2²⁰ = 20057503 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21106049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553039 + 10553040.

It is an arithmetic number, because the mean of its divisors is an integer number (10553040).

Almost surely, 2^21106079 is an apocalyptic number.

21106079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21106079 is an equidigital number, since it uses as much as digits as its factorization.

21106079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 21106079 is about 4594.1352831627. The cubic root of 21106079 is about 276.3561835275.

The spelling of 21106079 in words is "twenty-one million, one hundred six thousand, seventy-nine".