11165421 has 4 divisors (see below), whose sum is σ = 14887232. Its totient is φ = 7443612.

The previous prime is 11165411. The next prime is 11165431. The reversal of 11165421 is 12456111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (11165411) and next prime (11165431).

It is not a de Polignac number, because 11165421 - 2¹³ = 11157229 is a prime.

It is a super-2 number, since 2×11165421² = 249333252214482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11165411) 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, 1860901 + ... + 1860906.

It is an arithmetic number, because the mean of its divisors is an integer number (3721808).

Almost surely, 2^11165421 is an apocalyptic number.

It is an amenable number.

11165421 is a deficient number, since it is larger than the sum of its proper divisors (3721811).

11165421 is an equidigital number, since it uses as much as digits as its factorization.

11165421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3721810.

The product of its digits is 240, while the sum is 21.

The square root of 11165421 is about 3341.4698861429. The cubic root of 11165421 is about 223.5072942282.

The spelling of 11165421 in words is "eleven million, one hundred sixty-five thousand, four hundred twenty-one".