20243212123 has 4 divisors (see below), whose sum is σ = 21308644360. Its totient is φ = 19177779888.

The previous prime is 20243212109. The next prime is 20243212139. The reversal of 20243212123 is 32121234202.

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

It is a cyclic number.

It is not a de Polignac number, because 20243212123 - 2¹⁷ = 20243081051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20243212094 and 20243212103.

It is not an unprimeable number, because it can be changed into a prime (20243212183) 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, 532716090 + ... + 532716127.

It is an arithmetic number, because the mean of its divisors is an integer number (5327161090).

Almost surely, 2^20243212123 is an apocalyptic number.

20243212123 is a deficient number, since it is larger than the sum of its proper divisors (1065432237).

20243212123 is a wasteful number, since it uses less digits than its factorization.

20243212123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065432236.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 20243212123 its reverse (32121234202), we get a palindrome (52364446325).

The spelling of 20243212123 in words is "twenty billion, two hundred forty-three million, two hundred twelve thousand, one hundred twenty-three".