21100099499 has 2 divisors, whose sum is σ = 21100099500. Its totient is φ = 21100099498.

The previous prime is 21100099481. The next prime is 21100099523. The reversal of 21100099499 is 99499000112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21100099499 - 2⁸ = 21100099243 is a prime.

It is not a weakly prime, because it can be changed into another prime (21100090499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550049749 + 10550049750.

It is an arithmetic number, because the mean of its divisors is an integer number (10550049750).

Almost surely, 2^21100099499 is an apocalyptic number.

21100099499 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100099499 is an equidigital number, since it uses as much as digits as its factorization.

21100099499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 44.

The spelling of 21100099499 in words is "twenty-one billion, one hundred million, ninety-nine thousand, four hundred ninety-nine".