11656921 has 4 divisors (see below), whose sum is σ = 11718144. Its totient is φ = 11595700.

The previous prime is 11656907. The next prime is 11656933. The reversal of 11656921 is 12965611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11656921 - 2⁵ = 11656889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11656321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30325 + ... + 30706.

It is an arithmetic number, because the mean of its divisors is an integer number (2929536).

Almost surely, 2^11656921 is an apocalyptic number.

It is an amenable number.

11656921 is a deficient number, since it is larger than the sum of its proper divisors (61223).

11656921 is an equidigital number, since it uses as much as digits as its factorization.

11656921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61222.

The product of its digits is 3240, while the sum is 31.

The square root of 11656921 is about 3414.2233377446. The cubic root of 11656921 is about 226.7399001639.

The spelling of 11656921 in words is "eleven million, six hundred fifty-six thousand, nine hundred twenty-one".