1221012231223 has 4 divisors (see below), whose sum is σ = 1222071219568. Its totient is φ = 1219953242880.

The previous prime is 1221012231209. The next prime is 1221012231253. The reversal of 1221012231223 is 3221322101221.

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 1221012231223 - 2⁵ = 1221012231191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221012231194 and 1221012231203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221012231253) 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, 529492443 + ... + 529494748.

It is an arithmetic number, because the mean of its divisors is an integer number (305517804892).

Almost surely, 2^{1221012231223} is an apocalyptic number.

1221012231223 is a deficient number, since it is larger than the sum of its proper divisors (1058988345).

1221012231223 is a wasteful number, since it uses less digits than its factorization.

1221012231223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058988344.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1221012231223 its reverse (3221322101221), we get a palindrome (4442334332444).

The spelling of 1221012231223 in words is "one trillion, two hundred twenty-one billion, twelve million, two hundred thirty-one thousand, two hundred twenty-three".