1221212000212 has 24 divisors (see below), whose sum is σ = 2215610618760. Its totient is φ = 588271743360.

The previous prime is 1221212000191. The next prime is 1221212000227. The reversal of 1221212000212 is 2120002121221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 349311732676 + 871900267536 = 591026^2 + 933756^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11364843 + ... + 11471794.

It is an arithmetic number, because the mean of its divisors is an integer number (92317109115).

Almost surely, 2^{1221212000212} is an apocalyptic number.

It is an amenable number.

1221212000212 is a deficient number, since it is larger than the sum of its proper divisors (994398618548).

1221212000212 is a wasteful number, since it uses less digits than its factorization.

1221212000212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22837131 (or 22837129 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221212000212 its reverse (2120002121221), we get a palindrome (3341214121433).

It can be divided in two parts, 1221 and 212000212, that multiplied together give a palindrome (258852258852).

The spelling of 1221212000212 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, two hundred twelve", and thus it is an aban number.