21105046263 has 8 divisors (see below), whose sum is σ = 32160070528. Its totient is φ = 12060026424.

The previous prime is 21105046243. The next prime is 21105046267. The reversal of 21105046263 is 36264050112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21105046263 - 2⁵ = 21105046231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21105046263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21105046267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502501081 + ... + 502501122.

It is an arithmetic number, because the mean of its divisors is an integer number (4020008816).

Almost surely, 2^21105046263 is an apocalyptic number.

21105046263 is a deficient number, since it is larger than the sum of its proper divisors (11055024265).

21105046263 is a wasteful number, since it uses less digits than its factorization.

21105046263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005002213.

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 21105046263 its reverse (36264050112), we get a palindrome (57369096375).

The spelling of 21105046263 in words is "twenty-one billion, one hundred five million, forty-six thousand, two hundred sixty-three".