11637421 has 4 divisors (see below), whose sum is σ = 11666844. Its totient is φ = 11608000.

The previous prime is 11637413. The next prime is 11637463. The reversal of 11637421 is 12473611.

11637421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11485321 + 152100 = 3389^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 11637421 - 2³ = 11637413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11637491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14110 + ... + 14911.

It is an arithmetic number, because the mean of its divisors is an integer number (2916711).

Almost surely, 2^11637421 is an apocalyptic number.

It is an amenable number.

11637421 is a deficient number, since it is larger than the sum of its proper divisors (29423).

11637421 is an equidigital number, since it uses as much as digits as its factorization.

11637421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29422.

The product of its digits is 1008, while the sum is 25.

The square root of 11637421 is about 3411.3664417649. The cubic root of 11637421 is about 226.6133974687.

The spelling of 11637421 in words is "eleven million, six hundred thirty-seven thousand, four hundred twenty-one".