21899297 has 8 divisors (see below), whose sum is σ = 25066752. Its totient is φ = 18741600.

The previous prime is 21899279. The next prime is 21899303. The reversal of 21899297 is 79299812.

It is a happy number.

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 21899297 - 2¹⁶ = 21833761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21899497) 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, 3272 + ... + 7382.

It is an arithmetic number, because the mean of its divisors is an integer number (3133344).

Almost surely, 2^21899297 is an apocalyptic number.

It is an amenable number.

21899297 is a deficient number, since it is larger than the sum of its proper divisors (3167455).

21899297 is an equidigital number, since it uses as much as digits as its factorization.

21899297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4879.

The product of its digits is 163296, while the sum is 47.

The square root of 21899297 is about 4679.6684711633. The cubic root of 21899297 is about 279.7757430557.

The spelling of 21899297 in words is "twenty-one million, eight hundred ninety-nine thousand, two hundred ninety-seven".