1221022123 has 4 divisors (see below), whose sum is σ = 1225189728. Its totient is φ = 1216854520.

The previous prime is 1221022111. The next prime is 1221022133. The reversal of 1221022123 is 3212201221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221022123 - 2¹³ = 1221013931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221022097 and 1221022106.

It is not an unprimeable number, because it can be changed into a prime (1221022133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2083363 + ... + 2083948.

It is an arithmetic number, because the mean of its divisors is an integer number (306297432).

Almost surely, 2^1221022123 is an apocalyptic number.

1221022123 is a deficient number, since it is larger than the sum of its proper divisors (4167605).

1221022123 is an equidigital number, since it uses as much as digits as its factorization.

1221022123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4167604.

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

The square root of 1221022123 is about 34943.1269779910. The cubic root of 1221022123 is about 1068.8280536316.

Adding to 1221022123 its reverse (3212201221), we get a palindrome (4433223344).

The spelling of 1221022123 in words is "one billion, two hundred twenty-one million, twenty-two thousand, one hundred twenty-three".