1233220100 has 72 divisors (see below), whose sum is σ = 3088843968. Its totient is φ = 418608000.

The previous prime is 1233220097. The next prime is 1233220123. The reversal of 1233220100 is 10223321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61979 + ... + 79421.

Almost surely, 2^1233220100 is an apocalyptic number.

1233220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1233220100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1544421984).

1233220100 is an abundant number, since it is smaller than the sum of its proper divisors (1855623868).

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

1233220100 is a wasteful number, since it uses less digits than its factorization.

1233220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17565 (or 17558 counting only the distinct ones).

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

The square root of 1233220100 is about 35117.2336609819. The cubic root of 1233220100 is about 1072.3754544095.

Adding to 1233220100 its reverse (10223321), we get a palindrome (1243443421).

It can be divided in two parts, 123 and 3220100, that added together give a palindrome (3220223).

The spelling of 1233220100 in words is "one billion, two hundred thirty-three million, two hundred twenty thousand, one hundred".