1212220123 has 2 divisors, whose sum is σ = 1212220124. Its totient is φ = 1212220122.

The previous prime is 1212220117. The next prime is 1212220151. The reversal of 1212220123 is 3210222121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212220123 - 2⁵ = 1212220091 is a prime.

It is a super-2 number, since 2×1212220123² = 2938955253212270258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1212220097 and 1212220106.

It is not a weakly prime, because it can be changed into another prime (1212220153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606110061 + 606110062.

It is an arithmetic number, because the mean of its divisors is an integer number (606110062).

Almost surely, 2^1212220123 is an apocalyptic number.

1212220123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212220123 is an equidigital number, since it uses as much as digits as its factorization.

1212220123 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1212220123 is about 34816.9516615111. The cubic root of 1212220123 is about 1066.2535653050.

Adding to 1212220123 its reverse (3210222121), we get a palindrome (4422442244).

The spelling of 1212220123 in words is "one billion, two hundred twelve million, two hundred twenty thousand, one hundred twenty-three".