21415339 has 16 divisors (see below), whose sum is σ = 24092640. Its totient is φ = 18869760.

The previous prime is 21415321. The next prime is 21415349. The reversal of 21415339 is 93351412.

It is a cyclic number.

It is not a de Polignac number, because 21415339 - 2⁵ = 21415307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21415319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63379 + ... + 63715.

It is an arithmetic number, because the mean of its divisors is an integer number (1505790).

Almost surely, 2^21415339 is an apocalyptic number.

21415339 is a deficient number, since it is larger than the sum of its proper divisors (2677301).

21415339 is a wasteful number, since it uses less digits than its factorization.

21415339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510.

The product of its digits is 3240, while the sum is 28.

The square root of 21415339 is about 4627.6710125073. The cubic root of 21415339 is about 277.6994275677.

The spelling of 21415339 in words is "twenty-one million, four hundred fifteen thousand, three hundred thirty-nine".