1213213212 has 36 divisors (see below), whose sum is σ = 3097106376. Its totient is φ = 400399200.

The previous prime is 1213213193. The next prime is 1213213217. The reversal of 1213213212 is 2123123121.

1213213212 is a `hidden beast` number, since 1 + 21 + 321 + 321 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213213217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 163198 + ... + 170469.

Almost surely, 2^1213213212 is an apocalyptic number.

1213213212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1213213212 is an abundant number, since it is smaller than the sum of its proper divisors (1883893164).

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

1213213212 is a wasteful number, since it uses less digits than its factorization.

1213213212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333778 (or 333773 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1213213212 is about 34831.2103148886. The cubic root of 1213213212 is about 1066.5446553584.

Adding to 1213213212 its reverse (2123123121), we get a palindrome (3336336333).

Subtracting 1213213212 from its reverse (2123123121), we obtain a palindrome (909909909).

The spelling of 1213213212 in words is "one billion, two hundred thirteen million, two hundred thirteen thousand, two hundred twelve".