11667421 has 4 divisors (see below), whose sum is σ = 11915712. Its totient is φ = 11419132.

The previous prime is 11667413. The next prime is 11667437. The reversal of 11667421 is 12476611.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12476611 = 7 ⋅1782373.

It is a cyclic number.

It is not a de Polignac number, because 11667421 - 2³ = 11667413 is a prime.

It is a super-2 number, since 2×11667421² = 272257425582482, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 11667421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11667221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124075 + ... + 124168.

It is an arithmetic number, because the mean of its divisors is an integer number (2978928).

Almost surely, 2^11667421 is an apocalyptic number.

It is an amenable number.

11667421 is a deficient number, since it is larger than the sum of its proper divisors (248291).

11667421 is an equidigital number, since it uses as much as digits as its factorization.

11667421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248290.

The product of its digits is 2016, while the sum is 28.

The square root of 11667421 is about 3415.7606766283. The cubic root of 11667421 is about 226.8079585726.

The spelling of 11667421 in words is "eleven million, six hundred sixty-seven thousand, four hundred twenty-one".