21101100899 has 2 divisors, whose sum is σ = 21101100900. Its totient is φ = 21101100898.

The previous prime is 21101100821. The next prime is 21101100913. The reversal of 21101100899 is 99800110112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21101100899 is a prime.

It is not a weakly prime, because it can be changed into another prime (21101106899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550550449 + 10550550450.

It is an arithmetic number, because the mean of its divisors is an integer number (10550550450).

Almost surely, 2^21101100899 is an apocalyptic number.

21101100899 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101100899 is an equidigital number, since it uses as much as digits as its factorization.

21101100899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 32.

The spelling of 21101100899 in words is "twenty-one billion, one hundred one million, one hundred thousand, eight hundred ninety-nine".