1221012010112 has 64 divisors (see below), whose sum is σ = 2437484616000. Its totient is φ = 609252424704.

The previous prime is 1221012010111. The next prime is 1221012010121. The reversal of 1221012010112 is 2110102101221.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (1221012010111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166143014 + ... + 166150362.

It is an arithmetic number, because the mean of its divisors is an integer number (38085697125).

Almost surely, 2^{1221012010112} is an apocalyptic number.

It is an amenable number.

1221012010112 is a deficient number, since it is larger than the sum of its proper divisors (1216472605888).

1221012010112 is an equidigital number, since it uses as much as digits as its factorization.

1221012010112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9853 (or 9841 counting only the distinct ones).

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

Adding to 1221012010112 its reverse (2110102101221), we get a palindrome (3331114111333).

The spelling of 1221012010112 in words is "one trillion, two hundred twenty-one billion, twelve million, ten thousand, one hundred twelve".