2123103113221 has 4 divisors (see below), whose sum is σ = 2123313978700. Its totient is φ = 2122892247744.

The previous prime is 2123103113171. The next prime is 2123103113237. The reversal of 2123103113221 is 1223113013212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1502490029121 + 620613084100 = 1225761^2 + 787790^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123103113221 - 2¹⁵ = 2123103080453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2123103113192 and 2123103113201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123103113821) 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 3 ways as a sum of consecutive naturals, for example, 105417636 + ... + 105437773.

It is an arithmetic number, because the mean of its divisors is an integer number (530828494675).

Almost surely, 2^{2123103113221} is an apocalyptic number.

It is an amenable number.

2123103113221 is a deficient number, since it is larger than the sum of its proper divisors (210865479).

2123103113221 is a wasteful number, since it uses less digits than its factorization.

2123103113221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210865478.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 2123103113221 its reverse (1223113013212), we get a palindrome (3346216126433).

The spelling of 2123103113221 in words is "two trillion, one hundred twenty-three billion, one hundred three million, one hundred thirteen thousand, two hundred twenty-one".