2121221123 has 48 divisors (see below), whose sum is σ = 2665192320. Its totient is φ = 1678247424.

The previous prime is 2121221111. The next prime is 2121221129. The reversal of 2121221123 is 3211221212.

It is not a de Polignac number, because 2121221123 - 2⁸ = 2121220867 is a prime.

It is a super-2 number, since 2×2121221123² = 8999158105322762258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2121221129) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7495340 + ... + 7495622.

It is an arithmetic number, because the mean of its divisors is an integer number (55524840).

Almost surely, 2^2121221123 is an apocalyptic number.

2121221123 is a deficient number, since it is larger than the sum of its proper divisors (543971197).

2121221123 is a wasteful number, since it uses less digits than its factorization.

2121221123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496 (or 489 counting only the distinct ones).

The product of its digits is 96, while the sum is 17.

The square root of 2121221123 is about 46056.7163723164. The cubic root of 2121221123 is about 1284.8782602550.

Adding to 2121221123 its reverse (3211221212), we get a palindrome (5332442335).

The spelling of 2121221123 in words is "two billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-three".