21423100099 has 2 divisors, whose sum is σ = 21423100100. Its totient is φ = 21423100098.

The previous prime is 21423100073. The next prime is 21423100129. The reversal of 21423100099 is 99000132412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21423100099 - 2¹⁵ = 21423067331 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21423100099.

It is not a weakly prime, because it can be changed into another prime (21423100019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711550049 + 10711550050.

It is an arithmetic number, because the mean of its divisors is an integer number (10711550050).

Almost surely, 2^21423100099 is an apocalyptic number.

21423100099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423100099 is an equidigital number, since it uses as much as digits as its factorization.

21423100099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The spelling of 21423100099 in words is "twenty-one billion, four hundred twenty-three million, one hundred thousand, ninety-nine".