21123232099 has 2 divisors, whose sum is σ = 21123232100. Its totient is φ = 21123232098.

The previous prime is 21123232093. The next prime is 21123232133. The reversal of 21123232099 is 99023232112.

It is an a-pointer prime, because the next prime (21123232133) can be obtained adding 21123232099 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21123232099 - 2¹⁹ = 21122707811 is a prime.

It is not a weakly prime, because it can be changed into another prime (21123232093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561616049 + 10561616050.

It is an arithmetic number, because the mean of its divisors is an integer number (10561616050).

Almost surely, 2^21123232099 is an apocalyptic number.

21123232099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21123232099 is an equidigital number, since it uses as much as digits as its factorization.

21123232099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 21123232099 in words is "twenty-one billion, one hundred twenty-three million, two hundred thirty-two thousand, ninety-nine".