21045042763 has 8 divisors (see below), whose sum is σ = 21396342240. Its totient is φ = 20695268160.

The previous prime is 21045042721. The next prime is 21045042769. The reversal of 21045042763 is 36724054012.

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

It is a cyclic number.

It is not a de Polignac number, because 21045042763 - 2¹⁷ = 21044911691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21045042769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353370 + ... + 408607.

It is an arithmetic number, because the mean of its divisors is an integer number (2674542780).

Almost surely, 2^21045042763 is an apocalyptic number.

21045042763 is a deficient number, since it is larger than the sum of its proper divisors (351299477).

21045042763 is an equidigital number, since it uses as much as digits as its factorization.

21045042763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762437.

The product of its (nonzero) digits is 40320, while the sum is 34.

Adding to 21045042763 its reverse (36724054012), we get a palindrome (57769096775).

The spelling of 21045042763 in words is "twenty-one billion, forty-five million, forty-two thousand, seven hundred sixty-three".