21020118263 has 2 divisors, whose sum is σ = 21020118264. Its totient is φ = 21020118262.

The previous prime is 21020118257. The next prime is 21020118277. The reversal of 21020118263 is 36281102012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020118263 - 2²⁸ = 20751682807 is a prime.

It is a super-2 number, since 2×21020118263² (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 (21020118233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510059131 + 10510059132.

It is an arithmetic number, because the mean of its divisors is an integer number (10510059132).

Almost surely, 2^21020118263 is an apocalyptic number.

21020118263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020118263 is an equidigital number, since it uses as much as digits as its factorization.

21020118263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 21020118263 in words is "twenty-one billion, twenty million, one hundred eighteen thousand, two hundred sixty-three".