21323029999 has 2 divisors, whose sum is σ = 21323030000. Its totient is φ = 21323029998.

The previous prime is 21323029979. The next prime is 21323030021. The reversal of 21323029999 is 99992032312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21323029999 - 2⁵ = 21323029967 is a prime.

It is a super-4 number, since 4×21323029999⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21323029919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661514999 + 10661515000.

It is an arithmetic number, because the mean of its divisors is an integer number (10661515000).

Almost surely, 2^21323029999 is an apocalyptic number.

21323029999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323029999 is an equidigital number, since it uses as much as digits as its factorization.

21323029999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 472392, while the sum is 49.

The spelling of 21323029999 in words is "twenty-one billion, three hundred twenty-three million, twenty-nine thousand, nine hundred ninety-nine".