21342415 has 16 divisors (see below), whose sum is σ = 27832320. Its totient is φ = 15651360.

The previous prime is 21342407. The next prime is 21342421. The reversal of 21342415 is 51424312.

It is not a de Polignac number, because 21342415 - 2³ = 21342407 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 679 + ... + 6568.

It is an arithmetic number, because the mean of its divisors is an integer number (1739520).

Almost surely, 2^21342415 is an apocalyptic number.

21342415 is a deficient number, since it is larger than the sum of its proper divisors (6489905).

21342415 is a wasteful number, since it uses less digits than its factorization.

21342415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7302.

The product of its digits is 960, while the sum is 22.

The square root of 21342415 is about 4619.7851681653. The cubic root of 21342415 is about 277.3838596318.

Adding to 21342415 its reverse (51424312), we get a palindrome (72766727).

The spelling of 21342415 in words is "twenty-one million, three hundred forty-two thousand, four hundred fifteen".