11154221 has 8 divisors (see below), whose sum is σ = 12239640. Its totient is φ = 10101312.

The previous prime is 11154211. The next prime is 11154223. The reversal of 11154221 is 12245111.

11154221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 978121 + 10176100 = 989^2 + 3190^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-11154221 is a prime.

It is a super-2 number, since 2×11154221² = 248833292233682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11154221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11154223) 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, 7406 + ... + 8783.

It is an arithmetic number, because the mean of its divisors is an integer number (1529955).

Almost surely, 2^11154221 is an apocalyptic number.

It is an amenable number.

11154221 is a deficient number, since it is larger than the sum of its proper divisors (1085419).

11154221 is a wasteful number, since it uses less digits than its factorization.

11154221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16255.

The product of its digits is 80, while the sum is 17.

The square root of 11154221 is about 3339.7935564942. The cubic root of 11154221 is about 223.4325360626.

Adding to 11154221 its reverse (12245111), we get a palindrome (23399332).

The spelling of 11154221 in words is "eleven million, one hundred fifty-four thousand, two hundred twenty-one".