11851221 has 8 divisors (see below), whose sum is σ = 15817984. Its totient is φ = 7892640.

The previous prime is 11851219. The next prime is 11851291. The reversal of 11851221 is 12215811.

11851221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11851221 - 2¹ = 11851219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11851201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3441 + ... + 5961.

It is an arithmetic number, because the mean of its divisors is an integer number (1977248).

Almost surely, 2^11851221 is an apocalyptic number.

It is an amenable number.

11851221 is a deficient number, since it is larger than the sum of its proper divisors (3966763).

11851221 is a wasteful number, since it uses less digits than its factorization.

11851221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4091.

The product of its digits is 160, while the sum is 21.

The square root of 11851221 is about 3442.5602391244. The cubic root of 11851221 is about 227.9927475379.

The spelling of 11851221 in words is "eleven million, eight hundred fifty-one thousand, two hundred twenty-one".