1212111231 has 24 divisors (see below), whose sum is σ = 1718453520. Its totient is φ = 759048192.

The previous prime is 1212111227. The next prime is 1212111239. The reversal of 1212111231 is 1321112121.

It is not a de Polignac number, because 1212111231 - 2² = 1212111227 is a prime.

It is a super-2 number, since 2×1212111231² = 2938427272632670722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1212111231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212111239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114015 + ... + 124191.

It is an arithmetic number, because the mean of its divisors is an integer number (71602230).

Almost surely, 2^1212111231 is an apocalyptic number.

1212111231 is a deficient number, since it is larger than the sum of its proper divisors (506342289).

1212111231 is a wasteful number, since it uses less digits than its factorization.

1212111231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10283 (or 10246 counting only the distinct ones).

The product of its digits is 24, while the sum is 15.

The square root of 1212111231 is about 34815.3878479043. The cubic root of 1212111231 is about 1066.2216376713.

Adding to 1212111231 its reverse (1321112121), we get a palindrome (2533223352).

The spelling of 1212111231 in words is "one billion, two hundred twelve million, one hundred eleven thousand, two hundred thirty-one".