2121213123 has 16 divisors (see below), whose sum is σ = 3152786560. Its totient is φ = 1409530248.

The previous prime is 2121213113. The next prime is 2121213151. The reversal of 2121213123 is 3213121212.

It is not a de Polignac number, because 2121213123 - 2⁸ = 2121212867 is a prime.

It is a super-2 number, since 2×2121213123² = 8999090226374826258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121213096 and 2121213105.

It is not an unprimeable number, because it can be changed into a prime (2121213113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119665 + ... + 136242.

It is an arithmetic number, because the mean of its divisors is an integer number (197049160).

Almost surely, 2^2121213123 is an apocalyptic number.

2121213123 is a deficient number, since it is larger than the sum of its proper divisors (1031573437).

2121213123 is a wasteful number, since it uses less digits than its factorization.

2121213123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256223 (or 256217 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 2121213123 is about 46056.6295227951. The cubic root of 2121213123 is about 1284.8766449843.

Adding to 2121213123 its reverse (3213121212), we get a palindrome (5334334335).

The spelling of 2121213123 in words is "two billion, one hundred twenty-one million, two hundred thirteen thousand, one hundred twenty-three".