2123242121 has 16 divisors (see below), whose sum is σ = 2850787968. Its totient is φ = 1527206400.

The previous prime is 2123241997. The next prime is 2123242133. The reversal of 2123242121 is 1212423212.

It is a cyclic number.

It is not a de Polignac number, because 2123242121 - 2¹⁸ = 2122979977 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2123242093 and 2123242102.

It is not an unprimeable number, because it can be changed into a prime (2123242181) 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, 1059560 + ... + 1061561.

It is an arithmetic number, because the mean of its divisors is an integer number (178174248).

Almost surely, 2^2123242121 is an apocalyptic number.

It is an amenable number.

2123242121 is a deficient number, since it is larger than the sum of its proper divisors (727545847).

2123242121 is a wasteful number, since it uses less digits than its factorization.

2123242121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121152.

The product of its digits is 384, while the sum is 20.

The square root of 2123242121 is about 46078.6514668127. The cubic root of 2123242121 is about 1285.2861875757.

Adding to 2123242121 its reverse (1212423212), we get a palindrome (3335665333).

The spelling of 2123242121 in words is "two billion, one hundred twenty-three million, two hundred forty-two thousand, one hundred twenty-one".