11643421 has 2 divisors, whose sum is σ = 11643422. Its totient is φ = 11643420.

The previous prime is 11643397. The next prime is 11643431. The reversal of 11643421 is 12434611.

11643421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11492100 + 151321 = 3390^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 11643421 - 2⁵ = 11643389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11643392 and 11643401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11643431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5821710 + 5821711.

It is an arithmetic number, because the mean of its divisors is an integer number (5821711).

Almost surely, 2^11643421 is an apocalyptic number.

It is an amenable number.

11643421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11643421 is an equidigital number, since it uses as much as digits as its factorization.

11643421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 22.

The square root of 11643421 is about 3412.2457414436. The cubic root of 11643421 is about 226.6523364162.

The spelling of 11643421 in words is "eleven million, six hundred forty-three thousand, four hundred twenty-one".