21044411263 has 4 divisors (see below), whose sum is σ = 21044999200. Its totient is φ = 21043823328.

The previous prime is 21044411249. The next prime is 21044411273. The reversal of 21044411263 is 36211444012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21044411263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044411273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236538 + ... + 313111.

It is an arithmetic number, because the mean of its divisors is an integer number (5261249800).

Almost surely, 2^21044411263 is an apocalyptic number.

21044411263 is a deficient number, since it is larger than the sum of its proper divisors (587937).

21044411263 is an equidigital number, since it uses as much as digits as its factorization.

21044411263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587936.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21044411263 its reverse (36211444012), we get a palindrome (57255855275).

The spelling of 21044411263 in words is "twenty-one billion, forty-four million, four hundred eleven thousand, two hundred sixty-three".