1221013323 has 12 divisors (see below), whose sum is σ = 1772047368. Its totient is φ = 810149760.

The previous prime is 1221013307. The next prime is 1221013349. The reversal of 1221013323 is 3233101221.

It is not a de Polignac number, because 1221013323 - 2⁴ = 1221013307 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221013296 and 1221013305.

It is not an unprimeable number, because it can be changed into a prime (1221013363) 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, 319590 + ... + 323387.

It is an arithmetic number, because the mean of its divisors is an integer number (147670614).

Almost surely, 2^1221013323 is an apocalyptic number.

1221013323 is a deficient number, since it is larger than the sum of its proper divisors (551034045).

1221013323 is a wasteful number, since it uses less digits than its factorization.

1221013323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643194 (or 643191 counting only the distinct ones).

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

The square root of 1221013323 is about 34943.0010588673. The cubic root of 1221013323 is about 1068.8254859169.

Adding to 1221013323 its reverse (3233101221), we get a palindrome (4454114544).

The spelling of 1221013323 in words is "one billion, two hundred twenty-one million, thirteen thousand, three hundred twenty-three".