21694299 has 8 divisors (see below), whose sum is σ = 31555392. Its totient is φ = 13148040.

The previous prime is 21694273. The next prime is 21694301. The reversal of 21694299 is 99249612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21694299 - 2⁹ = 21693787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21694299.

It is not an unprimeable number, because it can be changed into a prime (21694249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328669 + ... + 328734.

It is an arithmetic number, because the mean of its divisors is an integer number (3944424).

Almost surely, 2^21694299 is an apocalyptic number.

21694299 is a deficient number, since it is larger than the sum of its proper divisors (9861093).

21694299 is a wasteful number, since it uses less digits than its factorization.

21694299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657417.

The product of its digits is 69984, while the sum is 42.

The square root of 21694299 is about 4657.7139242336. The cubic root of 21694299 is about 278.9000168455.

The spelling of 21694299 in words is "twenty-one million, six hundred ninety-four thousand, two hundred ninety-nine".