21010121112263 has 2 divisors, whose sum is σ = 21010121112264. Its totient is φ = 21010121112262.

The previous prime is 21010121112203. The next prime is 21010121112313. The reversal of 21010121112263 is 36221112101012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010121112263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010121112203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505060556131 + 10505060556132.

It is an arithmetic number, because the mean of its divisors is an integer number (10505060556132).

Almost surely, 2^{21010121112263} is an apocalyptic number.

21010121112263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010121112263 is an equidigital number, since it uses as much as digits as its factorization.

21010121112263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 21010121112263 its reverse (36221112101012), we get a palindrome (57231233213275).

The spelling of 21010121112263 in words is "twenty-one trillion, ten billion, one hundred twenty-one million, one hundred twelve thousand, two hundred sixty-three".