11518921 has 8 divisors (see below), whose sum is σ = 12161600. Its totient is φ = 10879920.

The previous prime is 11518919. The next prime is 11518943. The reversal of 11518921 is 12981511.

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 11518921 - 2¹ = 11518919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11518921.

It is not an unprimeable number, because it can be changed into a prime (11518321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7651 + ... + 9031.

It is an arithmetic number, because the mean of its divisors is an integer number (1520200).

Almost surely, 2^11518921 is an apocalyptic number.

11518921 is the 1960-th hex number.

It is an amenable number.

11518921 is a deficient number, since it is larger than the sum of its proper divisors (642679).

11518921 is a wasteful number, since it uses less digits than its factorization.

11518921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1839.

The product of its digits is 720, while the sum is 28.

The square root of 11518921 is about 3393.9535942614. The cubic root of 11518921 is about 225.8415954760.

The spelling of 11518921 in words is "eleven million, five hundred eighteen thousand, nine hundred twenty-one".