21294339 has 16 divisors (see below), whose sum is σ = 31501440. Its totient is φ = 12685760.

The previous prime is 21294289. The next prime is 21294341. The reversal of 21294339 is 93349212.

It is a cyclic number.

It is not a de Polignac number, because 21294339 - 2¹¹ = 21292291 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (21294359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3522 + ... + 7415.

It is an arithmetic number, because the mean of its divisors is an integer number (1968840).

Almost surely, 2^21294339 is an apocalyptic number.

21294339 is a deficient number, since it is larger than the sum of its proper divisors (10207101).

21294339 is a wasteful number, since it uses less digits than its factorization.

21294339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11010.

The product of its digits is 11664, while the sum is 33.

The square root of 21294339 is about 4614.5789623757. The cubic root of 21294339 is about 277.1754244229.

The spelling of 21294339 in words is "twenty-one million, two hundred ninety-four thousand, three hundred thirty-nine".