21244299 has 8 divisors (see below), whose sum is σ = 29816640. Its totient is φ = 13417416.

The previous prime is 21244291. The next prime is 21244303. The reversal of 21244299 is 99244212.

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

It is not a de Polignac number, because 21244299 - 2³ = 21244291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21244291) 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, 186297 + ... + 186410.

It is an arithmetic number, because the mean of its divisors is an integer number (3727080).

Almost surely, 2^21244299 is an apocalyptic number.

21244299 is a deficient number, since it is larger than the sum of its proper divisors (8572341).

21244299 is a wasteful number, since it uses less digits than its factorization.

21244299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372729.

The product of its digits is 10368, while the sum is 33.

The square root of 21244299 is about 4609.1538268971. The cubic root of 21244299 is about 276.9581407464.

The spelling of 21244299 in words is "twenty-one million, two hundred forty-four thousand, two hundred ninety-nine".