1223121055 has 32 divisors (see below), whose sum is σ = 1607880960. Its totient is φ = 887777280.

The previous prime is 1223121043. The next prime is 1223121127. The reversal of 1223121055 is 5501213221.

It is not a de Polignac number, because 1223121055 - 2⁹ = 1223120543 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1606875 + ... + 1607635.

It is an arithmetic number, because the mean of its divisors is an integer number (50246280).

Almost surely, 2^1223121055 is an apocalyptic number.

1223121055 is a deficient number, since it is larger than the sum of its proper divisors (384759905).

1223121055 is a wasteful number, since it uses less digits than its factorization.

1223121055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1223121055 is about 34973.1476278587. The cubic root of 1223121055 is about 1069.4401400480.

Adding to 1223121055 its reverse (5501213221), we get a palindrome (6724334276).

The spelling of 1223121055 in words is "one billion, two hundred twenty-three million, one hundred twenty-one thousand, fifty-five".