21126532263 has 16 divisors (see below), whose sum is σ = 29723708160. Its totient is φ = 13320617024.

The previous prime is 21126532249. The next prime is 21126532267. The reversal of 21126532263 is 36223562112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21126532263 - 2⁶ = 21126532199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21126532267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1713981 + ... + 1726262.

It is an arithmetic number, because the mean of its divisors is an integer number (1857731760).

Almost surely, 2^21126532263 is an apocalyptic number.

21126532263 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21126532263 is a deficient number, since it is larger than the sum of its proper divisors (8597175897).

21126532263 is a wasteful number, since it uses less digits than its factorization.

21126532263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3440358.

The product of its digits is 25920, while the sum is 33.

The spelling of 21126532263 in words is "twenty-one billion, one hundred twenty-six million, five hundred thirty-two thousand, two hundred sixty-three".