21334915 has 32 divisors (see below), whose sum is σ = 32348160. Its totient is φ = 13161984.

The previous prime is 21334909. The next prime is 21334919. The reversal of 21334915 is 51943312.

It is a cyclic number.

It is not a de Polignac number, because 21334915 - 2⁷ = 21334787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21334919) 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 31 ways as a sum of consecutive naturals, for example, 12906 + ... + 14464.

It is an arithmetic number, because the mean of its divisors is an integer number (1010880).

Almost surely, 2^21334915 is an apocalyptic number.

21334915 is a deficient number, since it is larger than the sum of its proper divisors (11013245).

21334915 is a wasteful number, since it uses less digits than its factorization.

21334915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1611.

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

The square root of 21334915 is about 4618.9733707827. The cubic root of 21334915 is about 277.3513637360.

The spelling of 21334915 in words is "twenty-one million, three hundred thirty-four thousand, nine hundred fifteen".