1212030100 has 18 divisors (see below), whose sum is σ = 2630105534. Its totient is φ = 484812000.

The previous prime is 1212030073. The next prime is 1212030107. The reversal of 1212030100 is 10302121.

It can be written as a sum of positive squares in 3 ways, for example, as 80784144 + 1131245956 = 8988^2 + 33634^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212030107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6060051 + ... + 6060250.

Almost surely, 2^1212030100 is an apocalyptic number.

1212030100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212030100 is an abundant number, since it is smaller than the sum of its proper divisors (1418075434).

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

1212030100 is a wasteful number, since it uses less digits than its factorization.

1212030100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12120315 (or 12120308 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1212030100 is about 34814.2226683291. Note that the first 3 decimals coincide. The cubic root of 1212030100 is about 1066.1978484471.

Adding to 1212030100 its reverse (10302121), we get a palindrome (1222332221).

The spelling of 1212030100 in words is "one billion, two hundred twelve million, thirty thousand, one hundred".