11051221 has 8 divisors (see below), whose sum is σ = 11570688. Its totient is φ = 10542000.

The previous prime is 11051213. The next prime is 11051239. The reversal of 11051221 is 12215011.

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

It is a cyclic number.

It is not a de Polignac number, because 11051221 - 2³ = 11051213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11051021) 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, 310 + ... + 4711.

It is an arithmetic number, because the mean of its divisors is an integer number (1446336).

Almost surely, 2^11051221 is an apocalyptic number.

It is an amenable number.

11051221 is a deficient number, since it is larger than the sum of its proper divisors (519467).

11051221 is an equidigital number, since it uses as much as digits as its factorization.

11051221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5123.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 11051221 is about 3324.3376783955. The cubic root of 11051221 is about 222.7426700499.

Adding to 11051221 its reverse (12215011), we get a palindrome (23266232).

The spelling of 11051221 in words is "eleven million, fifty-one thousand, two hundred twenty-one".