20211021223 has 2 divisors, whose sum is σ = 20211021224. Its totient is φ = 20211021222.

The previous prime is 20211021209. The next prime is 20211021253. The reversal of 20211021223 is 32212011202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20211021223 - 2²⁵ = 20177466791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20211021197 and 20211021206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211021203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105510611 + 10105510612.

It is an arithmetic number, because the mean of its divisors is an integer number (10105510612).

Almost surely, 2^20211021223 is an apocalyptic number.

20211021223 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211021223 is an equidigital number, since it uses as much as digits as its factorization.

20211021223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20211021223 its reverse (32212011202), we get a palindrome (52423032425).

The spelling of 20211021223 in words is "twenty billion, two hundred eleven million, twenty-one thousand, two hundred twenty-three".