21012223163 has 2 divisors, whose sum is σ = 21012223164. Its totient is φ = 21012223162.

The previous prime is 21012223123. The next prime is 21012223171. The reversal of 21012223163 is 36132221012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21012223163 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012223103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506111581 + 10506111582.

It is an arithmetic number, because the mean of its divisors is an integer number (10506111582).

Almost surely, 2^21012223163 is an apocalyptic number.

21012223163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012223163 is an equidigital number, since it uses as much as digits as its factorization.

21012223163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21012223163 its reverse (36132221012), we get a palindrome (57144444175).

The spelling of 21012223163 in words is "twenty-one billion, twelve million, two hundred twenty-three thousand, one hundred sixty-three".