21100099079 has 2 divisors, whose sum is σ = 21100099080. Its totient is φ = 21100099078.

The previous prime is 21100099061. The next prime is 21100099087. The reversal of 21100099079 is 97099000112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100099079 - 2²⁴ = 21083321863 is a prime.

It is a super-2 number, since 2×21100099079² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100099379) 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, 10550049539 + 10550049540.

It is an arithmetic number, because the mean of its divisors is an integer number (10550049540).

Almost surely, 2^21100099079 is an apocalyptic number.

21100099079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100099079 is an equidigital number, since it uses as much as digits as its factorization.

21100099079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 38.

The spelling of 21100099079 in words is "twenty-one billion, one hundred million, ninety-nine thousand, seventy-nine".