1221012110012 has 24 divisors (see below), whose sum is σ = 2251750288032. Its totient is φ = 578180504000.

The previous prime is 1221012109979. The next prime is 1221012110023. The reversal of 1221012110012 is 2100112101221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65693039 + ... + 65711622.

It is an arithmetic number, because the mean of its divisors is an integer number (93822928668).

Almost surely, 2^{1221012110012} is an apocalyptic number.

It is an amenable number.

1221012110012 is a deficient number, since it is larger than the sum of its proper divisors (1030738178020).

1221012110012 is a wasteful number, since it uses less digits than its factorization.

1221012110012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131404789 (or 131404787 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221012110012 its reverse (2100112101221), we get a palindrome (3321124211233).

The spelling of 1221012110012 in words is "one trillion, two hundred twenty-one billion, twelve million, one hundred ten thousand, twelve".