11137421 has 4 divisors (see below), whose sum is σ = 11521500. Its totient is φ = 10753344.

The previous prime is 11137409. The next prime is 11137453. The reversal of 11137421 is 12473111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12473111 = 7 ⋅1781873.

It can be written as a sum of positive squares in 2 ways, for example, as 6786025 + 4351396 = 2605^2 + 2086^2 .

It is a cyclic number.

It is not a de Polignac number, because 11137421 - 2¹⁴ = 11121037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11137393 and 11137402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11137921) 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, 191996 + ... + 192053.

It is an arithmetic number, because the mean of its divisors is an integer number (2880375).

Almost surely, 2^11137421 is an apocalyptic number.

It is an amenable number.

11137421 is a deficient number, since it is larger than the sum of its proper divisors (384079).

11137421 is an equidigital number, since it uses as much as digits as its factorization.

11137421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384078.

The product of its digits is 168, while the sum is 20.

The square root of 11137421 is about 3337.2774832189. The cubic root of 11137421 is about 223.3203049255.

The spelling of 11137421 in words is "eleven million, one hundred thirty-seven thousand, four hundred twenty-one".