1221323023 has 32 divisors (see below), whose sum is σ = 1366041600. Its totient is φ = 1087865856.

The previous prime is 1221323011. The next prime is 1221323041. The reversal of 1221323023 is 3203231221.

It is a cyclic number.

It is not a de Polignac number, because 1221323023 - 2²¹ = 1219225871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221323063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2781838 + ... + 2782276.

It is an arithmetic number, because the mean of its divisors is an integer number (42688800).

Almost surely, 2^1221323023 is an apocalyptic number.

1221323023 is a deficient number, since it is larger than the sum of its proper divisors (144718577).

1221323023 is a wasteful number, since it uses less digits than its factorization.

1221323023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1221323023 is about 34947.4322804981. The cubic root of 1221323023 is about 1068.9158445461.

Adding to 1221323023 its reverse (3203231221), we get a palindrome (4424554244).

The spelling of 1221323023 in words is "one billion, two hundred twenty-one million, three hundred twenty-three thousand, twenty-three".