55223302221 has 12 divisors (see below), whose sum is σ = 79779603072. Its totient is φ = 36809714376.

The previous prime is 55223302217. The next prime is 55223302223. The reversal of 55223302221 is 12220332255.

55223302221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55223302221 - 2² = 55223302217 is a prime.

It is a super-2 number, since 2×55223302221² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55223302223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 424551 + ... + 539156.

It is an arithmetic number, because the mean of its divisors is an integer number (6648300256).

Almost surely, 2^55223302221 is an apocalyptic number.

It is an amenable number.

55223302221 is a deficient number, since it is larger than the sum of its proper divisors (24556300851).

55223302221 is a wasteful number, since it uses less digits than its factorization.

55223302221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970080 (or 970077 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 55223302221 its reverse (12220332255), we get a palindrome (67443634476).

The spelling of 55223302221 in words is "fifty-five billion, two hundred twenty-three million, three hundred two thousand, two hundred twenty-one".