11867121 has 32 divisors (see below), whose sum is σ = 20647680. Its totient is φ = 6594048.

The previous prime is 11867111. The next prime is 11867129. The reversal of 11867121 is 12176811.

It is not a de Polignac number, because 11867121 - 2¹⁵ = 11834353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (11867129) 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 31 ways as a sum of consecutive naturals, for example, 6145 + ... + 7841.

It is an arithmetic number, because the mean of its divisors is an integer number (645240).

Almost surely, 2^11867121 is an apocalyptic number.

It is an amenable number.

11867121 is a deficient number, since it is larger than the sum of its proper divisors (8780559).

11867121 is a wasteful number, since it uses less digits than its factorization.

11867121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750 (or 1744 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The square root of 11867121 is about 3444.8687928570. The cubic root of 11867121 is about 228.0946629077.

The spelling of 11867121 in words is "eleven million, eight hundred sixty-seven thousand, one hundred twenty-one".