20211223223 has 2 divisors, whose sum is σ = 20211223224. Its totient is φ = 20211223222.

The previous prime is 20211223217. The next prime is 20211223231. The reversal of 20211223223 is 32232211202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211223223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20211223195 and 20211223204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211223213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105611611 + 10105611612.

It is an arithmetic number, because the mean of its divisors is an integer number (10105611612).

Almost surely, 2^20211223223 is an apocalyptic number.

20211223223 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211223223 is an equidigital number, since it uses as much as digits as its factorization.

20211223223 is an evil number, because the sum of its binary digits is even.

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

Adding to 20211223223 its reverse (32232211202), we get a palindrome (52443434425).

The spelling of 20211223223 in words is "twenty billion, two hundred eleven million, two hundred twenty-three thousand, two hundred twenty-three".