1213030100 has 36 divisors (see below), whose sum is σ = 2696486268. Its totient is φ = 473376000.

The previous prime is 1213030057. The next prime is 1213030103. The reversal of 1213030100 is 10303121.

It can be written as a sum of positive squares in 6 ways, for example, as 614444944 + 598585156 = 24788^2 + 24466^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213030103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143831 + ... + 152030.

Almost surely, 2^1213030100 is an apocalyptic number.

1213030100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213030100 is an abundant number, since it is smaller than the sum of its proper divisors (1483456168).

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

1213030100 is a wasteful number, since it uses less digits than its factorization.

1213030100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295916 (or 295909 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 1213030100 is about 34828.5816535787. The cubic root of 1213030100 is about 1066.4909942901.

Adding to 1213030100 its reverse (10303121), we get a palindrome (1223333221).

The spelling of 1213030100 in words is "one billion, two hundred thirteen million, thirty thousand, one hundred".