21163760473 has 8 divisors (see below), whose sum is σ = 21513049416. Its totient is φ = 20814547200.

The previous prime is 21163760399. The next prime is 21163760491. The reversal of 21163760473 is 37406736112.

It can be written as a sum of positive squares in 4 ways, for example, as 1375148889 + 19788611584 = 37083^2 + 140672^2 .

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 21163760473 - 2¹⁷ = 21163629401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21163460473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 950415 + ... + 972427.

It is an arithmetic number, because the mean of its divisors is an integer number (2689131177).

Almost surely, 2^21163760473 is an apocalyptic number.

It is an amenable number.

21163760473 is a deficient number, since it is larger than the sum of its proper divisors (349288943).

21163760473 is a wasteful number, since it uses less digits than its factorization.

21163760473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37835.

The product of its (nonzero) digits is 127008, while the sum is 40.

The spelling of 21163760473 in words is "twenty-one billion, one hundred sixty-three million, seven hundred sixty thousand, four hundred seventy-three".