1221323022 has 20 divisors (see below), whose sum is σ = 2736668616. Its totient is φ = 407107620.

The previous prime is 1221323011. The next prime is 1221323041. The reversal of 1221323022 is 2203231221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1221322986 and 1221323004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3769354 + ... + 3769677.

Almost surely, 2^1221323022 is an apocalyptic number.

1221323022 is an abundant number, since it is smaller than the sum of its proper divisors (1515345594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221323022 is an equidigital number, since it uses as much as digits as its factorization.

1221323022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7539045 (or 7539036 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1221323022 is about 34947.4322661909. The cubic root of 1221323022 is about 1068.9158442544.

Adding to 1221323022 its reverse (2203231221), we get a palindrome (3424554243).

The spelling of 1221323022 in words is "one billion, two hundred twenty-one million, three hundred twenty-three thousand, twenty-two".