2121111012 has 48 divisors (see below), whose sum is σ = 5299318080. Its totient is φ = 657964032.

The previous prime is 2121111007. The next prime is 2121111019. The reversal of 2121111012 is 2101111212.

It is a super-2 number, since 2×2121111012² = 8998223850455328288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (2121111019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40258 + ... + 76569.

It is an arithmetic number, because the mean of its divisors is an integer number (110402460).

Almost surely, 2^2121111012 is an apocalyptic number.

It is an amenable number.

2121111012 is an abundant number, since it is smaller than the sum of its proper divisors (3178207068).

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

2121111012 is a wasteful number, since it uses less digits than its factorization.

2121111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116940 (or 116938 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 2121111012 is about 46055.5209719747. The cubic root of 2121111012 is about 1284.8560275142.

Adding to 2121111012 its reverse (2101111212), we get a palindrome (4222222224).

It can be divided in two parts, 21211 and 11012, that added together give a palindrome (32223).

The spelling of 2121111012 in words is "two billion, one hundred twenty-one million, one hundred eleven thousand, twelve".