2123320121 has 8 divisors (see below), whose sum is σ = 2317977480. Its totient is φ = 1933137792.

The previous prime is 2123320037. The next prime is 2123320127. The reversal of 2123320121 is 1210233212.

It can be written as a sum of positive squares in 4 ways, for example, as 354192400 + 1769127721 = 18820^2 + 42061^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2123320121 - 2¹⁰ = 2123319097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2123320121.

It is not an unprimeable number, because it can be changed into a prime (2123320127) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1117766 + ... + 1119663.

It is an arithmetic number, because the mean of its divisors is an integer number (289747185).

Almost surely, 2^2123320121 is an apocalyptic number.

It is an amenable number.

2123320121 is a deficient number, since it is larger than the sum of its proper divisors (194657359).

2123320121 is a wasteful number, since it uses less digits than its factorization.

2123320121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2237515.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2123320121 is about 46079.4978379756. The cubic root of 2123320121 is about 1285.3019262573.

Adding to 2123320121 its reverse (1210233212), we get a palindrome (3333553333).

The spelling of 2123320121 in words is "two billion, one hundred twenty-three million, three hundred twenty thousand, one hundred twenty-one".