1213212113212 has 24 divisors (see below), whose sum is σ = 2318578053120. Its totient is φ = 550877709360.

The previous prime is 1213212113177. The next prime is 1213212113219. The reversal of 1213212113212 is 2123112123121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213212113219) 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, 14516412 + ... + 14599747.

It is an arithmetic number, because the mean of its divisors is an integer number (96607418880).

Almost surely, 2^{1213212113212} is an apocalyptic number.

It is an amenable number.

1213212113212 is a deficient number, since it is larger than the sum of its proper divisors (1105365939908).

1213212113212 is a wasteful number, since it uses less digits than its factorization.

1213212113212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29117121 (or 29117119 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

Adding to 1213212113212 its reverse (2123112123121), we get a palindrome (3336324236333).

Subtracting 1213212113212 from its reverse (2123112123121), we obtain a palindrome (909900009909).

The spelling of 1213212113212 in words is "one trillion, two hundred thirteen billion, two hundred twelve million, one hundred thirteen thousand, two hundred twelve".