21451673759 has 12 divisors (see below), whose sum is σ = 22818449664. Its totient is φ = 20162574432.

The previous prime is 21451673753. The next prime is 21451673767. The reversal of 21451673759 is 95737615412.

It is a de Polignac number, because none of the positive numbers 2^k-21451673759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21451673753) 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, 188102 + ... + 279795.

It is an arithmetic number, because the mean of its divisors is an integer number (1901537472).

Almost surely, 2^21451673759 is an apocalyptic number.

21451673759 is a deficient number, since it is larger than the sum of its proper divisors (1366775905).

21451673759 is a wasteful number, since it uses less digits than its factorization.

21451673759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468062 (or 468043 counting only the distinct ones).

The product of its digits is 1587600, while the sum is 50.

The spelling of 21451673759 in words is "twenty-one billion, four hundred fifty-one million, six hundred seventy-three thousand, seven hundred fifty-nine".