21299999599 has 2 divisors, whose sum is σ = 21299999600. Its totient is φ = 21299999598.

The previous prime is 21299999593. The next prime is 21299999659. The reversal of 21299999599 is 99599999212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21299999599 - 2⁷ = 21299999471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21299999593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10649999799 + 10649999800.

It is an arithmetic number, because the mean of its divisors is an integer number (10649999800).

Almost surely, 2^21299999599 is an apocalyptic number.

21299999599 is a deficient number, since it is larger than the sum of its proper divisors (1).

21299999599 is an equidigital number, since it uses as much as digits as its factorization.

21299999599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95659380, while the sum is 73.

The spelling of 21299999599 in words is "twenty-one billion, two hundred ninety-nine million, nine hundred ninety-nine thousand, five hundred ninety-nine".