1221310323 has 12 divisors (see below), whose sum is σ = 1797400800. Its totient is φ = 798844176.

The previous prime is 1221310309. The next prime is 1221310331. The reversal of 1221310323 is 3230131221.

1221310323 is a `hidden beast` number, since 12 + 21 + 310 + 323 = 666.

It is not a de Polignac number, because 1221310323 - 2⁹ = 1221309811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221310296 and 1221310305.

It is not an unprimeable number, because it can be changed into a prime (1221310333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1279723 + ... + 1280676.

It is an arithmetic number, because the mean of its divisors is an integer number (149783400).

Almost surely, 2^1221310323 is an apocalyptic number.

1221310323 is a deficient number, since it is larger than the sum of its proper divisors (576090477).

1221310323 is a wasteful number, since it uses less digits than its factorization.

1221310323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560458 (or 2560455 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1221310323 is about 34947.2505785505. The cubic root of 1221310323 is about 1068.9121394717.

Adding to 1221310323 its reverse (3230131221), we get a palindrome (4451441544).

The spelling of 1221310323 in words is "one billion, two hundred twenty-one million, three hundred ten thousand, three hundred twenty-three".