1221010121112 has 16 divisors (see below), whose sum is σ = 3052525302840. Its totient is φ = 407003373696.

The previous prime is 1221010121083. The next prime is 1221010121113. The reversal of 1221010121112 is 2111210101221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221010121091 and 1221010121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221010121113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25437710833 + ... + 25437710880.

Almost surely, 2^{1221010121112} is an apocalyptic number.

1221010121112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221010121112 is an abundant number, since it is smaller than the sum of its proper divisors (1831515181728).

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

1221010121112 is a wasteful number, since it uses less digits than its factorization.

1221010121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50875421722 (or 50875421718 counting only the distinct ones).

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

Adding to 1221010121112 its reverse (2111210101221), we get a palindrome (3332220222333).

The spelling of 1221010121112 in words is "one trillion, two hundred twenty-one billion, ten million, one hundred twenty-one thousand, one hundred twelve".