21612640111 has 2 divisors, whose sum is σ = 21612640112. Its totient is φ = 21612640110.

The previous prime is 21612640097. The next prime is 21612640123. The reversal of 21612640111 is 11104621612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21612640111 - 2¹⁹ = 21612115823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21612640151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10806320055 + 10806320056.

It is an arithmetic number, because the mean of its divisors is an integer number (10806320056).

Almost surely, 2^21612640111 is an apocalyptic number.

21612640111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21612640111 is an equidigital number, since it uses as much as digits as its factorization.

21612640111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 21612640111 in words is "twenty-one billion, six hundred twelve million, six hundred forty thousand, one hundred eleven".