21464799 has 4 divisors (see below), whose sum is σ = 28619736. Its totient is φ = 14309864.

The previous prime is 21464777. The next prime is 21464831. The reversal of 21464799 is 99746412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21464799 - 2⁷ = 21464671 is a prime.

It is a super-2 number, since 2×21464799² = 921475192220802, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21464799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21464719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3577464 + ... + 3577469.

It is an arithmetic number, because the mean of its divisors is an integer number (7154934).

Almost surely, 2^21464799 is an apocalyptic number.

21464799 is a deficient number, since it is larger than the sum of its proper divisors (7154937).

21464799 is an equidigital number, since it uses as much as digits as its factorization.

21464799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7154936.

The product of its digits is 108864, while the sum is 42.

The square root of 21464799 is about 4633.0118713424. The cubic root of 21464799 is about 277.9130509787.

The spelling of 21464799 in words is "twenty-one million, four hundred sixty-four thousand, seven hundred ninety-nine".