1231212100 has 36 divisors (see below), whose sum is σ = 2711621584. Its totient is φ = 485131680.

The previous prime is 1231212079. The next prime is 1231212107. The reversal of 1231212100 is 12121321.

It is not an unprimeable number, because it can be changed into a prime (1231212107) 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 11 ways as a sum of consecutive naturals, for example, 85182 + ... + 98581.

Almost surely, 2^1231212100 is an apocalyptic number.

1231212100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231212100 is an abundant number, since it is smaller than the sum of its proper divisors (1480409484).

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

1231212100 is a wasteful number, since it uses less digits than its factorization.

1231212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183844 (or 183837 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1231212100 is about 35088.6320622506. The cubic root of 1231212100 is about 1071.7931037283.

Adding to 1231212100 its reverse (12121321), we get a palindrome (1243333421).

The spelling of 1231212100 in words is "one billion, two hundred thirty-one million, two hundred twelve thousand, one hundred".