2121121072 has 20 divisors (see below), whose sum is σ = 4696768336. Its totient is φ = 909051840.

The previous prime is 2121121063. The next prime is 2121121117. The reversal of 2121121072 is 2701211212.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 9469179 + ... + 9469402.

Almost surely, 2^2121121072 is an apocalyptic number.

It is an amenable number.

2121121072 is an abundant number, since it is smaller than the sum of its proper divisors (2575647264).

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

2121121072 is a wasteful number, since it uses less digits than its factorization.

2121121072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18938596 (or 18938590 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 2121121072 is about 46055.6301878500. The cubic root of 2121121072 is about 1284.8580587816.

Adding to 2121121072 its reverse (2701211212), we get a palindrome (4822332284).

The spelling of 2121121072 in words is "two billion, one hundred twenty-one million, one hundred twenty-one thousand, seventy-two".