1221012101112 has 64 divisors (see below), whose sum is σ = 3100212900000. Its totient is φ = 400694697984.

The previous prime is 1221012101039. The next prime is 1221012101117. The reversal of 1221012101112 is 2111012101221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221012101091 and 1221012101100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221012101117) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1106737 + ... + 1914912.

Almost surely, 2^{1221012101112} is an apocalyptic number.

1221012101112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221012101112 is an abundant number, since it is smaller than the sum of its proper divisors (1879200798888).

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

1221012101112 is a wasteful number, since it uses less digits than its factorization.

1221012101112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3021920 (or 3021916 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221012101112 its reverse (2111012101221), we get a palindrome (3332024202333).

The spelling of 1221012101112 in words is "one trillion, two hundred twenty-one billion, twelve million, one hundred one thousand, one hundred twelve".