11938221 has 12 divisors (see below), whose sum is σ = 17321148. Its totient is φ = 7923264.

The previous prime is 11938207. The next prime is 11938253. The reversal of 11938221 is 12283911.

It can be written as a sum of positive squares in 2 ways, for example, as 1920996 + 10017225 = 1386^2 + 3165^2 .

It is not a de Polignac number, because 11938221 - 2¹⁰ = 11937197 is a prime.

It is a super-2 number, since 2×11938221² = 285042241289682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11938271) 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 11 ways as a sum of consecutive naturals, for example, 750 + ... + 4943.

It is an arithmetic number, because the mean of its divisors is an integer number (1443429).

Almost surely, 2^11938221 is an apocalyptic number.

It is an amenable number.

11938221 is a deficient number, since it is larger than the sum of its proper divisors (5382927).

11938221 is a wasteful number, since it uses less digits than its factorization.

11938221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5932 (or 5929 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 11938221 is about 3455.1730781540. The cubic root of 11938221 is about 228.5492873456.

The spelling of 11938221 in words is "eleven million, nine hundred thirty-eight thousand, two hundred twenty-one".