21899153 has 8 divisors (see below), whose sum is σ = 23675520. Its totient is φ = 20185200.

The previous prime is 21899117. The next prime is 21899159. The reversal of 21899153 is 35199812.

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 21899153 - 2¹⁸ = 21637009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21899159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14873 + ... + 16278.

It is an arithmetic number, because the mean of its divisors is an integer number (2959440).

Almost surely, 2^21899153 is an apocalyptic number.

It is an amenable number.

21899153 is a deficient number, since it is larger than the sum of its proper divisors (1776367).

21899153 is a wasteful number, since it uses less digits than its factorization.

21899153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31207.

The product of its digits is 19440, while the sum is 38.

The square root of 21899153 is about 4679.6530854327. The cubic root of 21899153 is about 279.7751298275.

The spelling of 21899153 in words is "twenty-one million, eight hundred ninety-nine thousand, one hundred fifty-three".