20123122112321 has 4 divisors (see below), whose sum is σ = 20123137954500. Its totient is φ = 20123106270144.

The previous prime is 20123122112309. The next prime is 20123122112333. The reversal of 20123122112321 is 12321122132102.

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

It is an interprime number because it is at equal distance from previous prime (20123122112309) and next prime (20123122112333).

It can be written as a sum of positive squares in 2 ways, for example, as 863531581696 + 19259590530625 = 929264^2 + 4388575^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123122112321 - 2³⁰ = 20122048370497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20123122112521) 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, 5832116 + ... + 8617413.

It is an arithmetic number, because the mean of its divisors is an integer number (5030784488625).

Almost surely, 2^{20123122112321} is an apocalyptic number.

It is an amenable number.

20123122112321 is a deficient number, since it is larger than the sum of its proper divisors (15842179).

20123122112321 is a wasteful number, since it uses less digits than its factorization.

20123122112321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15842178.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 20123122112321 its reverse (12321122132102), we get a palindrome (32444244244423).

The spelling of 20123122112321 in words is "twenty trillion, one hundred twenty-three billion, one hundred twenty-two million, one hundred twelve thousand, three hundred twenty-one".