21730299 has 8 divisors (see below), whose sum is σ = 29017872. Its totient is φ = 14464800.

The previous prime is 21730283. The next prime is 21730307. The reversal of 21730299 is 99203712.

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

It is not a de Polignac number, because 21730299 - 2⁴ = 21730283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21730249) 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, 3064 + ... + 7269.

It is an arithmetic number, because the mean of its divisors is an integer number (3627234).

Almost surely, 2^21730299 is an apocalyptic number.

21730299 is a deficient number, since it is larger than the sum of its proper divisors (7287573).

21730299 is a wasteful number, since it uses less digits than its factorization.

21730299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11037.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 21730299 is about 4661.5768791258. The cubic root of 21730299 is about 279.0542025445.

The spelling of 21730299 in words is "twenty-one million, seven hundred thirty thousand, two hundred ninety-nine".