21121101263 has 2 divisors, whose sum is σ = 21121101264. Its totient is φ = 21121101262.

The previous prime is 21121101247. The next prime is 21121101289. The reversal of 21121101263 is 36210112112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21121101263 - 2⁴ = 21121101247 is a prime.

It is a super-2 number, since 2×21121101263² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121101763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560550631 + 10560550632.

It is an arithmetic number, because the mean of its divisors is an integer number (10560550632).

Almost surely, 2^21121101263 is an apocalyptic number.

21121101263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121101263 is an equidigital number, since it uses as much as digits as its factorization.

21121101263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21121101263 its reverse (36210112112), we get a palindrome (57331213375).

The spelling of 21121101263 in words is "twenty-one billion, one hundred twenty-one million, one hundred one thousand, two hundred sixty-three".