11909421 has 24 divisors (see below), whose sum is σ = 17690400. Its totient is φ = 7718496.

The previous prime is 11909419. The next prime is 11909431. The reversal of 11909421 is 12490911.

11909421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11909421 - 2¹ = 11909419 is a prime.

It is a Curzon number.

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11909411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79855 + ... + 80003.

It is an arithmetic number, because the mean of its divisors is an integer number (737100).

Almost surely, 2^11909421 is an apocalyptic number.

It is an amenable number.

11909421 is a deficient number, since it is larger than the sum of its proper divisors (5780979).

11909421 is a wasteful number, since it uses less digits than its factorization.

11909421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 11909421 is about 3451.0028977096. The cubic root of 11909421 is about 228.3653537538.

The spelling of 11909421 in words is "eleven million, nine hundred nine thousand, four hundred twenty-one".