21211012099 has 2 divisors, whose sum is σ = 21211012100. Its totient is φ = 21211012098.

The previous prime is 21211012087. The next prime is 21211012117. The reversal of 21211012099 is 99021011212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211012099 - 2²⁷ = 21076794371 is a prime.

It is not a weakly prime, because it can be changed into another prime (21211012399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605506049 + 10605506050.

It is an arithmetic number, because the mean of its divisors is an integer number (10605506050).

Almost surely, 2^21211012099 is an apocalyptic number.

21211012099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211012099 is an equidigital number, since it uses as much as digits as its factorization.

21211012099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 21211012099 in words is "twenty-one billion, two hundred eleven million, twelve thousand, ninety-nine".