20311011223 has 2 divisors, whose sum is σ = 20311011224. Its totient is φ = 20311011222.

The previous prime is 20311011211. The next prime is 20311011233. The reversal of 20311011223 is 32211011302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20311011223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20311011197 and 20311011206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20311011233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155505611 + 10155505612.

It is an arithmetic number, because the mean of its divisors is an integer number (10155505612).

Almost surely, 2^20311011223 is an apocalyptic number.

20311011223 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311011223 is an equidigital number, since it uses as much as digits as its factorization.

20311011223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20311011223 its reverse (32211011302), we get a palindrome (52522022525).

The spelling of 20311011223 in words is "twenty billion, three hundred eleven million, eleven thousand, two hundred twenty-three".