1222220055 has 32 divisors (see below), whose sum is σ = 2247436800. Its totient is φ = 555599232.

The previous prime is 1222220047. The next prime is 1222220059. The reversal of 1222220055 is 5500222221.

It is not a de Polignac number, because 1222220055 - 2³ = 1222220047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222220059) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13720 + ... + 51309.

It is an arithmetic number, because the mean of its divisors is an integer number (70232400).

Almost surely, 2^1222220055 is an apocalyptic number.

1222220055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1222220055 is a deficient number, since it is larger than the sum of its proper divisors (1025216745).

1222220055 is a wasteful number, since it uses less digits than its factorization.

1222220055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65223.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 1222220055 is about 34960.2639435116. The cubic root of 1222220055 is about 1069.1774780492.

Adding to 1222220055 its reverse (5500222221), we get a palindrome (6722442276).

The spelling of 1222220055 in words is "one billion, two hundred twenty-two million, two hundred twenty thousand, fifty-five".