21238094099 has 2 divisors, whose sum is σ = 21238094100. Its totient is φ = 21238094098.

The previous prime is 21238094089. The next prime is 21238094147. The reversal of 21238094099 is 99049083212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21238094099 - 2²⁰ = 21237045523 is a prime.

It is not a weakly prime, because it can be changed into another prime (21238094029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10619047049 + 10619047050.

It is an arithmetic number, because the mean of its divisors is an integer number (10619047050).

Almost surely, 2^21238094099 is an apocalyptic number.

21238094099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21238094099 is an equidigital number, since it uses as much as digits as its factorization.

21238094099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 21238094099 in words is "twenty-one billion, two hundred thirty-eight million, ninety-four thousand, ninety-nine".