11957421 has 12 divisors (see below), whose sum is σ = 18546432. Its totient is φ = 6832728.

The previous prime is 11957381. The next prime is 11957453. The reversal of 11957421 is 12475911.

It is not a de Polignac number, because 11957421 - 2¹¹ = 11955373 is a prime.

It is a Curzon number.

It is a nialpdrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11957461) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40525 + ... + 40818.

It is an arithmetic number, because the mean of its divisors is an integer number (1545536).

Almost surely, 2^11957421 is an apocalyptic number.

It is an amenable number.

11957421 is a deficient number, since it is larger than the sum of its proper divisors (6589011).

11957421 is an equidigital number, since it uses as much as digits as its factorization.

11957421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81360 (or 81353 counting only the distinct ones).

The product of its digits is 2520, while the sum is 30.

The square root of 11957421 is about 3457.9504045026. The cubic root of 11957421 is about 228.6717454562.

The spelling of 11957421 in words is "eleven million, nine hundred fifty-seven thousand, four hundred twenty-one".