21213299999 has 2 divisors, whose sum is σ = 21213300000. Its totient is φ = 21213299998.

The previous prime is 21213299981. The next prime is 21213300011. The reversal of 21213299999 is 99999231212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21213299999 - 2³² = 16918332703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213299909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606649999 + 10606650000.

It is an arithmetic number, because the mean of its divisors is an integer number (10606650000).

Almost surely, 2^21213299999 is an apocalyptic number.

21213299999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213299999 is an equidigital number, since it uses as much as digits as its factorization.

21213299999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1417176, while the sum is 56.

The spelling of 21213299999 in words is "twenty-one billion, two hundred thirteen million, two hundred ninety-nine thousand, nine hundred ninety-nine".