21394299 has 4 divisors (see below), whose sum is σ = 28525736. Its totient is φ = 14262864.

The previous prime is 21394297. The next prime is 21394327. The reversal of 21394299 is 99249312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21394299 - 2¹ = 21394297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21394297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3565714 + ... + 3565719.

It is an arithmetic number, because the mean of its divisors is an integer number (7131434).

Almost surely, 2^21394299 is an apocalyptic number.

21394299 is a deficient number, since it is larger than the sum of its proper divisors (7131437).

21394299 is an equidigital number, since it uses as much as digits as its factorization.

21394299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7131436.

The product of its digits is 34992, while the sum is 39.

The square root of 21394299 is about 4625.3971721356. The cubic root of 21394299 is about 277.6084536718.

The spelling of 21394299 in words is "twenty-one million, three hundred ninety-four thousand, two hundred ninety-nine".