21314999 has 2 divisors, whose sum is σ = 21315000. Its totient is φ = 21314998.

The previous prime is 21314947. The next prime is 21315001. The reversal of 21314999 is 99941312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21314999 - 2⁸ = 21314743 is a prime.

Together with 21315001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21314929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10657499 + 10657500.

It is an arithmetic number, because the mean of its divisors is an integer number (10657500).

Almost surely, 2^21314999 is an apocalyptic number.

21314999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21314999 is an equidigital number, since it uses as much as digits as its factorization.

21314999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 38.

The square root of 21314999 is about 4616.8169770958. The cubic root of 21314999 is about 277.2650349889.

The spelling of 21314999 in words is "twenty-one million, three hundred fourteen thousand, nine hundred ninety-nine".