1220323100 has 18 divisors (see below), whose sum is σ = 2648101344. Its totient is φ = 488129200.

The previous prime is 1220323067. The next prime is 1220323129. The reversal of 1220323100 is 13230221.

It is a happy number.

It is a super-2 number, since 2×1220323100² = 2978376936787220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6101516 + ... + 6101715.

Almost surely, 2^1220323100 is an apocalyptic number.

1220323100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220323100 is an abundant number, since it is smaller than the sum of its proper divisors (1427778244).

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

1220323100 is a wasteful number, since it uses less digits than its factorization.

1220323100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12203245 (or 12203238 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1220323100 is about 34933.1232500044. The cubic root of 1220323100 is about 1068.6240502261.

Adding to 1220323100 its reverse (13230221), we get a palindrome (1233553321).

The spelling of 1220323100 in words is "one billion, two hundred twenty million, three hundred twenty-three thousand, one hundred".