1021111212112 has 20 divisors (see below), whose sum is σ = 1980532607220. Its totient is φ = 510006023168.

The previous prime is 1021111212103. The next prime is 1021111212119. The reversal of 1021111212112 is 2112121111201.

It can be written as a sum of positive squares in 2 ways, for example, as 97059663936 + 924051548176 = 311544^2 + 961276^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021111212119) 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, 34333603 + ... + 34363330.

It is an arithmetic number, because the mean of its divisors is an integer number (99026630361).

Almost surely, 2^{1021111212112} is an apocalyptic number.

It is an amenable number.

1021111212112 is a deficient number, since it is larger than the sum of its proper divisors (959421395108).

1021111212112 is an equidigital number, since it uses as much as digits as its factorization.

1021111212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68697870 (or 68697864 counting only the distinct ones).

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

Adding to 1021111212112 its reverse (2112121111201), we get a palindrome (3133232323313).

The spelling of 1021111212112 in words is "one trillion, twenty-one billion, one hundred eleven million, two hundred twelve thousand, one hundred twelve".