2123112421321 has 32 divisors (see below), whose sum is σ = 2249356344480. Its totient is φ = 2000949350400.

The previous prime is 2123112421271. The next prime is 2123112421357. The reversal of 2123112421321 is 1231242113212.

It can be written as a sum of positive squares in 16 ways, for example, as 1668282224400 + 454830196921 = 1291620^2 + 674411^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123112421321 - 2¹¹ = 2123112419273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123112401321) 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, 244678435 + ... + 244687111.

It is an arithmetic number, because the mean of its divisors is an integer number (70292385765).

Almost surely, 2^{2123112421321} is an apocalyptic number.

It is an amenable number.

2123112421321 is a deficient number, since it is larger than the sum of its proper divisors (126243923159).

2123112421321 is a wasteful number, since it uses less digits than its factorization.

2123112421321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9805.

The product of its digits is 1152, while the sum is 25.

Adding to 2123112421321 its reverse (1231242113212), we get a palindrome (3354354534533).

The spelling of 2123112421321 in words is "two trillion, one hundred twenty-three billion, one hundred twelve million, four hundred twenty-one thousand, three hundred twenty-one".