21140913 has 8 divisors (see below), whose sum is σ = 29160000. Its totient is φ = 13607888.

The previous prime is 21140909. The next prime is 21140921. The reversal of 21140913 is 31904112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21140913 - 2² = 21140909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21140913.

It is not an unprimeable number, because it can be changed into a prime (21140213) 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 7 ways as a sum of consecutive naturals, for example, 121413 + ... + 121586.

It is an arithmetic number, because the mean of its divisors is an integer number (3645000).

Almost surely, 2^21140913 is an apocalyptic number.

It is an amenable number.

21140913 is a deficient number, since it is larger than the sum of its proper divisors (8019087).

21140913 is a wasteful number, since it uses less digits than its factorization.

21140913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243031.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21140913 is about 4597.9248580202. The cubic root of 21140913 is about 276.5081350128.

The spelling of 21140913 in words is "twenty-one million, one hundred forty thousand, nine hundred thirteen".