21952999 has 8 divisors (see below), whose sum is σ = 23672880. Its totient is φ = 20289600.

The previous prime is 21952993. The next prime is 21953011. The reversal of 21952999 is 99925912.

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

It is a cyclic number.

It is not a de Polignac number, because 21952999 - 2⁷ = 21952871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21952993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13312 + ... + 14869.

It is an arithmetic number, because the mean of its divisors is an integer number (2959110).

Almost surely, 2^21952999 is an apocalyptic number.

21952999 is a deficient number, since it is larger than the sum of its proper divisors (1719881).

21952999 is a wasteful number, since it uses less digits than its factorization.

21952999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28241.

The product of its digits is 131220, while the sum is 46.

The square root of 21952999 is about 4685.4027575012. The cubic root of 21952999 is about 280.0042473845.

The spelling of 21952999 in words is "twenty-one million, nine hundred fifty-two thousand, nine hundred ninety-nine".