21468899 has 2 divisors, whose sum is σ = 21468900. Its totient is φ = 21468898.

The previous prime is 21468829. The next prime is 21468901. The reversal of 21468899 is 99886412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21468899 is a prime.

Together with 21468901, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21468809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10734449 + 10734450.

It is an arithmetic number, because the mean of its divisors is an integer number (10734450).

Almost surely, 2^21468899 is an apocalyptic number.

21468899 is a deficient number, since it is larger than the sum of its proper divisors (1).

21468899 is an equidigital number, since it uses as much as digits as its factorization.

21468899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 47.

The square root of 21468899 is about 4633.4543269574. The cubic root of 21468899 is about 277.9307446139.

The spelling of 21468899 in words is "twenty-one million, four hundred sixty-eight thousand, eight hundred ninety-nine".