11656421 has 8 divisors (see below), whose sum is σ = 13504704. Its totient is φ = 9853920.

The previous prime is 11656399. The next prime is 11656451. The reversal of 11656421 is 12465611.

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 11656421 - 2⁶ = 11656357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11656451) 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, 10895 + ... + 11916.

It is an arithmetic number, because the mean of its divisors is an integer number (1688088).

Almost surely, 2^11656421 is an apocalyptic number.

It is an amenable number.

11656421 is a deficient number, since it is larger than the sum of its proper divisors (1848283).

11656421 is an equidigital number, since it uses as much as digits as its factorization.

11656421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22891.

The product of its digits is 1440, while the sum is 26.

The square root of 11656421 is about 3414.1501138644. The cubic root of 11656421 is about 226.7366582681.

The spelling of 11656421 in words is "eleven million, six hundred fifty-six thousand, four hundred twenty-one".