1211021220112 has 20 divisors (see below), whose sum is σ = 2559658488336. Its totient is φ = 550464190880.

The previous prime is 1211021220023. The next prime is 1211021220163. The reversal of 1211021220112 is 2110221201121.

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 3440401018 + ... + 3440401369.

Almost surely, 2^{1211021220112} is an apocalyptic number.

It is an amenable number.

1211021220112 is an abundant number, since it is smaller than the sum of its proper divisors (1348637268224).

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

1211021220112 is a wasteful number, since it uses less digits than its factorization.

1211021220112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6880802406 (or 6880802400 counting only the distinct ones).

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

Adding to 1211021220112 its reverse (2110221201121), we get a palindrome (3321242421233).

The spelling of 1211021220112 in words is "one trillion, two hundred eleven billion, twenty-one million, two hundred twenty thousand, one hundred twelve".