21074913 has 12 divisors (see below), whose sum is σ = 30481360. Its totient is φ = 14031576.

The previous prime is 21074903. The next prime is 21074927. The reversal of 21074913 is 31947012.

It is not a de Polignac number, because 21074913 - 2⁴ = 21074897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21074903) 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 11 ways as a sum of consecutive naturals, for example, 12558 + ... + 14136.

Almost surely, 2^21074913 is an apocalyptic number.

It is an amenable number.

21074913 is a deficient number, since it is larger than the sum of its proper divisors (9406447).

21074913 is a wasteful number, since it uses less digits than its factorization.

21074913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3068 (or 3065 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 21074913 is about 4590.7420968728. The cubic root of 21074913 is about 276.2200906720.

The spelling of 21074913 in words is "twenty-one million, seventy-four thousand, nine hundred thirteen".