20021223263 has 2 divisors, whose sum is σ = 20021223264. Its totient is φ = 20021223262.

The previous prime is 20021223259. The next prime is 20021223281. The reversal of 20021223263 is 36232212002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021223263 - 2² = 20021223259 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021223293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010611631 + 10010611632.

It is an arithmetic number, because the mean of its divisors is an integer number (10010611632).

Almost surely, 2^20021223263 is an apocalyptic number.

20021223263 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021223263 is an equidigital number, since it uses as much as digits as its factorization.

20021223263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 20021223263 its reverse (36232212002), we get a palindrome (56253435265).

The spelling of 20021223263 in words is "twenty billion, twenty-one million, two hundred twenty-three thousand, two hundred sixty-three".