11921171 has 4 divisors (see below), whose sum is σ = 11929344. Its totient is φ = 11913000.

The previous prime is 11921137. The next prime is 11921177. The reversal of 11921171 is 17112911.

It is a happy number.

11921171 is nontrivially palindromic in base 13.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 17112911 = 811 ⋅21101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11921171 is a prime.

It is a super-2 number, since 2×11921171² = 284228636022482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11921177) 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, 1235 + ... + 5036.

It is an arithmetic number, because the mean of its divisors is an integer number (2982336).

Almost surely, 2^11921171 is an apocalyptic number.

11921171 is a deficient number, since it is larger than the sum of its proper divisors (8173).

11921171 is an equidigital number, since it uses as much as digits as its factorization.

11921171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8172.

The product of its digits is 126, while the sum is 23.

The square root of 11921171 is about 3452.7048816833. The cubic root of 11921171 is about 228.4404318770.

The spelling of 11921171 in words is "eleven million, nine hundred twenty-one thousand, one hundred seventy-one".