55221311 has 8 divisors (see below), whose sum is σ = 56037744. Its totient is φ = 54408640.

The previous prime is 55221269. The next prime is 55221319. The reversal of 55221311 is 11312255.

It is a happy number.

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 55221311 - 2⁶ = 55221247 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 (55221319) 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, 42605 + ... + 43881.

It is an arithmetic number, because the mean of its divisors is an integer number (7004718).

Almost surely, 2^55221311 is an apocalyptic number.

55221311 is a deficient number, since it is larger than the sum of its proper divisors (816433).

55221311 is a wasteful number, since it uses less digits than its factorization.

55221311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881.

The product of its digits is 300, while the sum is 20.

The square root of 55221311 is about 7431.1042920955. The cubic root of 55221311 is about 380.8046453861.

Adding to 55221311 its reverse (11312255), we get a palindrome (66533566).

The spelling of 55221311 in words is "fifty-five million, two hundred twenty-one thousand, three hundred eleven".