1221222103 has 16 divisors (see below), whose sum is σ = 1297244160. Its totient is φ = 1147736800.

The previous prime is 1221222089. The next prime is 1221222113. The reversal of 1221222103 is 3012221221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1221222103 - 2²⁹ = 684351191 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 (1221222113) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 257988 + ... + 262678.

It is an arithmetic number, because the mean of its divisors is an integer number (81077760).

Almost surely, 2^1221222103 is an apocalyptic number.

1221222103 is a deficient number, since it is larger than the sum of its proper divisors (76022057).

1221222103 is a wasteful number, since it uses less digits than its factorization.

1221222103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4958.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1221222103 is about 34945.9883677655. The cubic root of 1221222103 is about 1068.8864016233.

Adding to 1221222103 its reverse (3012221221), we get a palindrome (4233443324).

The spelling of 1221222103 in words is "one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred three".