2121220112 has 40 divisors (see below), whose sum is σ = 4495158720. Its totient is φ = 961681280.

The previous prime is 2121220091. The next prime is 2121220133. The reversal of 2121220112 is 2110221212.

It is an interprime number because it is at equal distance from previous prime (2121220091) and next prime (2121220133).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52973 + ... + 83955.

It is an arithmetic number, because the mean of its divisors is an integer number (112378968).

Almost surely, 2^2121220112 is an apocalyptic number.

2121220112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2121220112 is an abundant number, since it is smaller than the sum of its proper divisors (2373938608).

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

2121220112 is a wasteful number, since it uses less digits than its factorization.

2121220112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31391 (or 31385 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2121220112 is about 46056.7053967172. The cubic root of 2121220112 is about 1284.8780561254.

Adding to 2121220112 its reverse (2110221212), we get a palindrome (4231441324).

The spelling of 2121220112 in words is "two billion, one hundred twenty-one million, two hundred twenty thousand, one hundred twelve".