21102122099 has 2 divisors, whose sum is σ = 21102122100. Its totient is φ = 21102122098.

The previous prime is 21102122081. The next prime is 21102122131. The reversal of 21102122099 is 99022120112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21102122099 - 2²⁴ = 21085344883 is a prime.

It is a super-2 number, since 2×21102122099² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21102182099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551061049 + 10551061050.

It is an arithmetic number, because the mean of its divisors is an integer number (10551061050).

Almost surely, 2^21102122099 is an apocalyptic number.

21102122099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102122099 is an equidigital number, since it uses as much as digits as its factorization.

21102122099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 21102122099 in words is "twenty-one billion, one hundred two million, one hundred twenty-two thousand, ninety-nine".