2121333123 has 32 divisors (see below), whose sum is σ = 3501836800. Its totient is φ = 1118920608.

The previous prime is 2121333121. The next prime is 2121333143. The reversal of 2121333123 is 3213331212.

It is not a de Polignac number, because 2121333123 - 2¹ = 2121333121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 2121333123.

It is not an unprimeable number, because it can be changed into a prime (2121333121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23148 + ... + 69126.

It is an arithmetic number, because the mean of its divisors is an integer number (109432400).

Almost surely, 2^2121333123 is an apocalyptic number.

2121333123 is a deficient number, since it is larger than the sum of its proper divisors (1380503677).

2121333123 is an equidigital number, since it uses as much as digits as its factorization.

2121333123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46028 (or 46002 counting only the distinct ones).

The product of its digits is 648, while the sum is 21.

The square root of 2121333123 is about 46057.9322484195. The cubic root of 2121333123 is about 1284.9008736184.

Adding to 2121333123 its reverse (3213331212), we get a palindrome (5334664335).

The spelling of 2121333123 in words is "two billion, one hundred twenty-one million, three hundred thirty-three thousand, one hundred twenty-three".