1221231323 has 8 divisors (see below), whose sum is σ = 1315506528. Its totient is φ = 1127003904.

The previous prime is 1221231317. The next prime is 1221231331. The reversal of 1221231323 is 3231321221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221231323 - 2⁴ = 1221231307 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221231295 and 1221231304.

It is not an unprimeable number, because it can be changed into a prime (1221231523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55115 + ... + 74027.

It is an arithmetic number, because the mean of its divisors is an integer number (164438316).

Almost surely, 2^1221231323 is an apocalyptic number.

1221231323 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1221231323 is a deficient number, since it is larger than the sum of its proper divisors (94275205).

1221231323 is a wasteful number, since it uses less digits than its factorization.

1221231323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23893.

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

The square root of 1221231323 is about 34946.1202853765. The cubic root of 1221231323 is about 1068.8890915811.

Adding to 1221231323 its reverse (3231321221), we get a palindrome (4452552544).

The spelling of 1221231323 in words is "one billion, two hundred twenty-one million, two hundred thirty-one thousand, three hundred twenty-three".