20123211223 has 2 divisors, whose sum is σ = 20123211224. Its totient is φ = 20123211222.

The previous prime is 20123211217. The next prime is 20123211259. The reversal of 20123211223 is 32211232102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20123211223 - 2¹⁷ = 20123080151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20123211223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123211203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061605611 + 10061605612.

It is an arithmetic number, because the mean of its divisors is an integer number (10061605612).

Almost surely, 2^20123211223 is an apocalyptic number.

20123211223 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123211223 is an equidigital number, since it uses as much as digits as its factorization.

20123211223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20123211223 its reverse (32211232102), we get a palindrome (52334443325).

The spelling of 20123211223 in words is "twenty billion, one hundred twenty-three million, two hundred eleven thousand, two hundred twenty-three".