11331421 has 6 divisors (see below), whose sum is σ = 11543966. Its totient is φ = 11119800.

The previous prime is 11331389. The next prime is 11331473. The reversal of 11331421 is 12413311.

It can be written as a sum of positive squares in only one way, i.e., 6687396 + 4644025 = 2586^2 + 2155^2 .

It is not a de Polignac number, because 11331421 - 2⁵ = 11331389 is a prime.

It is a super-2 number, since 2×11331421² = 256802203758482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11331395 and 11331404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11331491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26076 + ... + 26506.

Almost surely, 2^11331421 is an apocalyptic number.

It is an amenable number.

11331421 is a deficient number, since it is larger than the sum of its proper divisors (212545).

11331421 is an frugal number, since it uses more digits than its factorization.

11331421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923 (or 492 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 11331421 is about 3366.2176103158. The cubic root of 11331421 is about 224.6095020887.

Adding to 11331421 its reverse (12413311), we get a palindrome (23744732).

The spelling of 11331421 in words is "eleven million, three hundred thirty-one thousand, four hundred twenty-one".