21563374741263 has 12 divisors (see below), whose sum is σ = 31147206709320. Its totient is φ = 14375532455856.

The previous prime is 21563374741199. The next prime is 21563374741327. The reversal of 21563374741263 is 36214747336512.

21563374741263 is a `hidden beast` number, since 2 + 1 + 5 + 6 + 3 + 374 + 7 + 4 + 1 + 263 = 666.

It is an interprime number because it is at equal distance from previous prime (21563374741199) and next prime (21563374741327).

It is not a de Polignac number, because 21563374741263 - 2⁶ = 21563374741199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21563374741963) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1435048 + ... + 6722061.

It is an arithmetic number, because the mean of its divisors is an integer number (2595600559110).

Almost surely, 2^{21563374741263} is an apocalyptic number.

21563374741263 is a deficient number, since it is larger than the sum of its proper divisors (9583831968057).

21563374741263 is a wasteful number, since it uses less digits than its factorization.

21563374741263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8450838 (or 8450835 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 54.

The spelling of 21563374741263 in words is "twenty-one trillion, five hundred sixty-three billion, three hundred seventy-four million, seven hundred forty-one thousand, two hundred sixty-three".