1211212113212 has 24 divisors (see below), whose sum is σ = 2155684648320. Its totient is φ = 595303525040.

The previous prime is 1211212113161. The next prime is 1211212113217. The reversal of 1211212113212 is 2123112121121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211212113217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3735287 + ... + 4046577.

It is an arithmetic number, because the mean of its divisors is an integer number (89820193680).

Almost surely, 2^{1211212113212} is an apocalyptic number.

It is an amenable number.

1211212113212 is a deficient number, since it is larger than the sum of its proper divisors (944472535108).

1211212113212 is a wasteful number, since it uses less digits than its factorization.

1211212113212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327841 (or 327839 counting only the distinct ones).

The product of its digits is 96, while the sum is 20.

Adding to 1211212113212 its reverse (2123112121121), we get a palindrome (3334324234333).

The spelling of 1211212113212 in words is "one trillion, two hundred eleven billion, two hundred twelve million, one hundred thirteen thousand, two hundred twelve".