21001012112263 has 2 divisors, whose sum is σ = 21001012112264. Its totient is φ = 21001012112262.

The previous prime is 21001012112177. The next prime is 21001012112299. The reversal of 21001012112263 is 36221121010012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21001012112263 - 2¹³ = 21001012104071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001012112863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500506056131 + 10500506056132.

It is an arithmetic number, because the mean of its divisors is an integer number (10500506056132).

Almost surely, 2^{21001012112263} is an apocalyptic number.

21001012112263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001012112263 is an equidigital number, since it uses as much as digits as its factorization.

21001012112263 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 22.

Adding to 21001012112263 its reverse (36221121010012), we get a palindrome (57222133122275).

The spelling of 21001012112263 in words is "twenty-one trillion, one billion, twelve million, one hundred twelve thousand, two hundred sixty-three".