1221233123 has 16 divisors (see below), whose sum is σ = 1386223200. Its totient is φ = 1065684480.

The previous prime is 1221233119. The next prime is 1221233161. The reversal of 1221233123 is 3213321221.

It is a cyclic number.

It is not a de Polignac number, because 1221233123 - 2² = 1221233119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221233095 and 1221233104.

It is not an unprimeable number, because it can be changed into a prime (1221233183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44123 + ... + 66251.

It is an arithmetic number, because the mean of its divisors is an integer number (86638950).

Almost surely, 2^1221233123 is an apocalyptic number.

1221233123 is a deficient number, since it is larger than the sum of its proper divisors (164990077).

1221233123 is a wasteful number, since it uses less digits than its factorization.

1221233123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22342.

The product of its digits is 432, while the sum is 20.

The square root of 1221233123 is about 34946.1460392988. The cubic root of 1221233123 is about 1068.8896167340.

Adding to 1221233123 its reverse (3213321221), we get a palindrome (4434554344).

The spelling of 1221233123 in words is "one billion, two hundred twenty-one million, two hundred thirty-three thousand, one hundred twenty-three".