121211231312 has 20 divisors (see below), whose sum is σ = 234857864340. Its totient is φ = 60602750208.

The previous prime is 121211231269. The next prime is 121211231321. The reversal of 121211231312 is 213132112121.

It can be written as a sum of positive squares in 2 ways, for example, as 47989036096 + 73222195216 = 219064^2 + 270596^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193364 + ... + 528972.

It is an arithmetic number, because the mean of its divisors is an integer number (11742893217).

Almost surely, 2^121211231312 is an apocalyptic number.

It is an amenable number.

121211231312 is a deficient number, since it is larger than the sum of its proper divisors (113646633028).

121211231312 is a wasteful number, since it uses less digits than its factorization.

121211231312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358190 (or 358184 counting only the distinct ones).

The product of its digits is 144, while the sum is 20.

Adding to 121211231312 its reverse (213132112121), we get a palindrome (334343343433).

The spelling of 121211231312 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred thirty-one thousand, three hundred twelve".