20212123223 has 4 divisors (see below), whose sum is σ = 20231690688. Its totient is φ = 20192555760.

The previous prime is 20212123213. The next prime is 20212123289. The reversal of 20212123223 is 32232121202.

It is a happy number.

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 20212123223 - 2⁶ = 20212123159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212123195 and 20212123204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212123213) 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, 9782183 + ... + 9784248.

It is an arithmetic number, because the mean of its divisors is an integer number (5057922672).

Almost surely, 2^20212123223 is an apocalyptic number.

20212123223 is a deficient number, since it is larger than the sum of its proper divisors (19567465).

20212123223 is a wasteful number, since it uses less digits than its factorization.

20212123223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19567464.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20212123223 its reverse (32232121202), we get a palindrome (52444244425).

The spelling of 20212123223 in words is "twenty billion, two hundred twelve million, one hundred twenty-three thousand, two hundred twenty-three".