21430339 has 8 divisors (see below), whose sum is σ = 24533600. Its totient is φ = 18337536.

The previous prime is 21430327. The next prime is 21430369. The reversal of 21430339 is 93303412.

It is a happy number.

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

It is not a de Polignac number, because 21430339 - 2⁹ = 21429827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21430369) 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, 2437 + ... + 6985.

It is an arithmetic number, because the mean of its divisors is an integer number (3066700).

Almost surely, 2^21430339 is an apocalyptic number.

21430339 is a deficient number, since it is larger than the sum of its proper divisors (3103261).

21430339 is an equidigital number, since it uses as much as digits as its factorization.

21430339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5229.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 21430339 is about 4629.2914144607. The cubic root of 21430339 is about 277.7642490063.

It can be divided in two parts, 2 and 1430339, that added together give a palindrome (1430341).

The spelling of 21430339 in words is "twenty-one million, four hundred thirty thousand, three hundred thirty-nine".