1221211210012 has 12 divisors (see below), whose sum is σ = 2137307180400. Its totient is φ = 610552015616.

The previous prime is 1221211209989. The next prime is 1221211210069. The reversal of 1221211210012 is 2100121121221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13346053 + ... + 13437244.

It is an arithmetic number, because the mean of its divisors is an integer number (178108931700).

Almost surely, 2^{1221211210012} is an apocalyptic number.

It is an amenable number.

1221211210012 is a deficient number, since it is larger than the sum of its proper divisors (916095970388).

1221211210012 is a wasteful number, since it uses less digits than its factorization.

1221211210012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26794700 (or 26794698 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221211210012 its reverse (2100121121221), we get a palindrome (3321332331233).

The spelling of 1221211210012 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred ten thousand, twelve".