2113121123321 has 4 divisors (see below), whose sum is σ = 2275668902052. Its totient is φ = 1950573344592.

The previous prime is 2113121123303. The next prime is 2113121123431. The reversal of 2113121123321 is 1233211213112.

It is a happy number.

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 87950206096 + 2025170917225 = 296564^2 + 1423085^2 .

It is a cyclic number.

It is not a de Polignac number, because 2113121123321 - 2¹⁴ = 2113121106937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2113121129321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81273889346 + ... + 81273889371.

It is an arithmetic number, because the mean of its divisors is an integer number (568917225513).

Almost surely, 2^{2113121123321} is an apocalyptic number.

It is an amenable number.

2113121123321 is a deficient number, since it is larger than the sum of its proper divisors (162547778731).

2113121123321 is a wasteful number, since it uses less digits than its factorization.

2113121123321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162547778730.

The product of its digits is 432, while the sum is 23.

Adding to 2113121123321 its reverse (1233211213112), we get a palindrome (3346332336433).

The spelling of 2113121123321 in words is "two trillion, one hundred thirteen billion, one hundred twenty-one million, one hundred twenty-three thousand, three hundred twenty-one".