21064113 has 24 divisors (see below), whose sum is σ = 36286848. Its totient is φ = 11512512.

The previous prime is 21064081. The next prime is 21064117. The reversal of 21064113 is 31146012.

It is a happy number.

21064113 is a `hidden beast` number, since 2 + 10 + 641 + 13 = 666.

It is not a de Polignac number, because 21064113 - 2⁵ = 21064081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21064117) 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 23 ways as a sum of consecutive naturals, for example, 5820 + ... + 8717.

It is an arithmetic number, because the mean of its divisors is an integer number (1511952).

Almost surely, 2^21064113 is an apocalyptic number.

21064113 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21064113 is a deficient number, since it is larger than the sum of its proper divisors (15222735).

21064113 is a wasteful number, since it uses less digits than its factorization.

21064113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14573 (or 14570 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21064113 is about 4589.5656657248. The cubic root of 21064113 is about 276.1728989120.

The spelling of 21064113 in words is "twenty-one million, sixty-four thousand, one hundred thirteen".