1231212121212 has 96 divisors (see below), whose sum is σ = 3023368427520. Its totient is φ = 389452423680.

The previous prime is 1231212121201. The next prime is 1231212121229. The reversal of 1231212121212 is 2121212121321.

It is a nude number because it is divisible by every one of its digits.

1231212121212 is a modest number, since divided by 12121212 gives 12312 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72934989 + ... + 72951867.

It is an arithmetic number, because the mean of its divisors is an integer number (31493421120).

Almost surely, 2^{1231212121212} is an apocalyptic number.

1231212121212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1231212121212 is an abundant number, since it is smaller than the sum of its proper divisors (1792156306308).

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

1231212121212 is a wasteful number, since it uses less digits than its factorization.

1231212121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20971 (or 20969 counting only the distinct ones).

The product of its digits is 192, while the sum is 21.

Adding to 1231212121212 its reverse (2121212121321), we get a palindrome (3352424242533).

The spelling of 1231212121212 in words is "one trillion, two hundred thirty-one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twelve".