21911107 has 2 divisors, whose sum is σ = 21911108. Its totient is φ = 21911106.

The previous prime is 21911059. The next prime is 21911119. The reversal of 21911107 is 70111912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21911107 - 2¹⁹ = 21386819 is a prime.

It is not a weakly prime, because it can be changed into another prime (21911137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10955553 + 10955554.

It is an arithmetic number, because the mean of its divisors is an integer number (10955554).

Almost surely, 2^21911107 is an apocalyptic number.

21911107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21911107 is an equidigital number, since it uses as much as digits as its factorization.

21911107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 22.

The square root of 21911107 is about 4680.9301426105. The cubic root of 21911107 is about 279.8260271316.

The spelling of 21911107 in words is "twenty-one million, nine hundred eleven thousand, one hundred seven".