20340221263 has 2 divisors, whose sum is σ = 20340221264. Its totient is φ = 20340221262.

The previous prime is 20340221203. The next prime is 20340221299. The reversal of 20340221263 is 36212204302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20340221263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20340221203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10170110631 + 10170110632.

It is an arithmetic number, because the mean of its divisors is an integer number (10170110632).

Almost surely, 2^20340221263 is an apocalyptic number.

20340221263 is a deficient number, since it is larger than the sum of its proper divisors (1).

20340221263 is an equidigital number, since it uses as much as digits as its factorization.

20340221263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 20340221263 its reverse (36212204302), we get a palindrome (56552425565).

The spelling of 20340221263 in words is "twenty billion, three hundred forty million, two hundred twenty-one thousand, two hundred sixty-three".