1216230100 has 36 divisors (see below), whose sum is σ = 2646857500. Its totient is φ = 485084160.

The previous prime is 1216230089. The next prime is 1216230107. The reversal of 1216230100 is 10326121.

It can be written as a sum of positive squares in 6 ways, for example, as 124456336 + 1091773764 = 11156^2 + 33042^2 .

It is a super-2 number, since 2×1216230100² = 2958431312292020000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216230107) 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, 17476 + ... + 52324.

Almost surely, 2^1216230100 is an apocalyptic number.

1216230100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216230100 is an abundant number, since it is smaller than the sum of its proper divisors (1430627400).

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

1216230100 is a wasteful number, since it uses less digits than its factorization.

1216230100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35212 (or 35205 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1216230100 is about 34874.4906772844. The cubic root of 1216230100 is about 1067.4279797185.

Adding to 1216230100 its reverse (10326121), we get a palindrome (1226556221).

The spelling of 1216230100 in words is "one billion, two hundred sixteen million, two hundred thirty thousand, one hundred".