21322999 has 2 divisors, whose sum is σ = 21323000. Its totient is φ = 21322998.

The previous prime is 21322991. The next prime is 21323011. The reversal of 21322999 is 99922312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21322999 - 2³ = 21322991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21322991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661499 + 10661500.

It is an arithmetic number, because the mean of its divisors is an integer number (10661500).

Almost surely, 2^21322999 is an apocalyptic number.

21322999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322999 is an equidigital number, since it uses as much as digits as its factorization.

21322999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 37.

The square root of 21322999 is about 4617.6832936008. The cubic root of 21322999 is about 277.2997185911.

The spelling of 21322999 in words is "twenty-one million, three hundred twenty-two thousand, nine hundred ninety-nine".