21106097 has 2 divisors, whose sum is σ = 21106098. Its totient is φ = 21106096.

The previous prime is 21106087. The next prime is 21106109. The reversal of 21106097 is 79060112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17631601 + 3474496 = 4199^2 + 1864^2 .

It is a cyclic number.

It is not a de Polignac number, because 21106097 - 2²² = 16911793 is a prime.

It is not a weakly prime, because it can be changed into another prime (21106037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553048 + 10553049.

It is an arithmetic number, because the mean of its divisors is an integer number (10553049).

Almost surely, 2^21106097 is an apocalyptic number.

It is an amenable number.

21106097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21106097 is an equidigital number, since it uses as much as digits as its factorization.

21106097 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 21106097 is about 4594.1372421816. The cubic root of 21106097 is about 276.3562620896.

The spelling of 21106097 in words is "twenty-one million, one hundred six thousand, ninety-seven".