21952899 has 12 divisors (see below), whose sum is σ = 33575256. Its totient is φ = 13774272.

The previous prime is 21952891. The next prime is 21952921. The reversal of 21952899 is 99825912.

It is not a de Polignac number, because 21952899 - 2³ = 21952891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21952891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71589 + ... + 71894.

It is an arithmetic number, because the mean of its divisors is an integer number (2797938).

Almost surely, 2^21952899 is an apocalyptic number.

21952899 is a deficient number, since it is larger than the sum of its proper divisors (11622357).

21952899 is a wasteful number, since it uses less digits than its factorization.

21952899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143506 (or 143503 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 21952899 is about 4685.3920860479. The cubic root of 21952899 is about 280.0038222267.

The spelling of 21952899 in words is "twenty-one million, nine hundred fifty-two thousand, eight hundred ninety-nine".