11831421 has 8 divisors (see below), whose sum is σ = 18028864. Its totient is φ = 6760800.

The previous prime is 11831419. The next prime is 11831423. The reversal of 11831421 is 12413811.

It is a happy number.

11831421 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (11831419) and next prime (11831423).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11831421 - 2¹ = 11831419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 563401 = 11831421 / (1 + 1 + 8 + 3 + 1 + 4 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11831423) 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, 281680 + ... + 281721.

It is an arithmetic number, because the mean of its divisors is an integer number (2253608).

Almost surely, 2^11831421 is an apocalyptic number.

It is an amenable number.

11831421 is a deficient number, since it is larger than the sum of its proper divisors (6197443).

11831421 is an equidigital number, since it uses as much as digits as its factorization.

11831421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563411.

The product of its digits is 192, while the sum is 21.

The square root of 11831421 is about 3439.6832703027. The cubic root of 11831421 is about 227.8657065422.

The spelling of 11831421 in words is "eleven million, eight hundred thirty-one thousand, four hundred twenty-one".