1211213212 has 72 divisors (see below), whose sum is σ = 2560248432. Its totient is φ = 495475200.

The previous prime is 1211213209. The next prime is 1211213233. The reversal of 1211213212 is 2123121121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 394162 + ... + 397222.

It is an arithmetic number, because the mean of its divisors is an integer number (35559006).

Almost surely, 2^1211213212 is an apocalyptic number.

It is an amenable number.

1211213212 is an abundant number, since it is smaller than the sum of its proper divisors (1349035220).

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

1211213212 is a wasteful number, since it uses less digits than its factorization.

1211213212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3139 (or 3114 counting only the distinct ones).

The product of its digits is 48, while the sum is 16.

The square root of 1211213212 is about 34802.4885891799. The cubic root of 1211213212 is about 1065.9582614453.

Adding to 1211213212 its reverse (2123121121), we get a palindrome (3334334333).

The spelling of 1211213212 in words is "one billion, two hundred eleven million, two hundred thirteen thousand, two hundred twelve".