1220342123 has 16 divisors (see below), whose sum is σ = 1638502656. Its totient is φ = 877767840.

The previous prime is 1220342099. The next prime is 1220342147. The reversal of 1220342123 is 3212430221.

It is an interprime number because it is at equal distance from previous prime (1220342099) and next prime (1220342147).

It is a cyclic number.

It is not a de Polignac number, because 1220342123 - 2¹² = 1220338027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220342095 and 1220342104.

It is not an unprimeable number, because it can be changed into a prime (1220342153) 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, 608561 + ... + 610562.

It is an arithmetic number, because the mean of its divisors is an integer number (102406416).

Almost surely, 2^1220342123 is an apocalyptic number.

1220342123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1220342123 is a deficient number, since it is larger than the sum of its proper divisors (418160533).

1220342123 is a wasteful number, since it uses less digits than its factorization.

1220342123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219154.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1220342123 is about 34933.3955263441. The cubic root of 1220342123 is about 1068.6296029440.

Adding to 1220342123 its reverse (3212430221), we get a palindrome (4432772344).

It can be divided in two parts, 1220 and 342123, that added together give a palindrome (343343).

The spelling of 1220342123 in words is "one billion, two hundred twenty million, three hundred forty-two thousand, one hundred twenty-three".