21730263733 has 4 divisors (see below), whose sum is σ = 21733699180. Its totient is φ = 21726828288.

The previous prime is 21730263727. The next prime is 21730263757. The reversal of 21730263733 is 33736203712.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4495300209 + 17234963524 = 67047^2 + 131282^2 .

It is a cyclic number.

It is not a de Polignac number, because 21730263733 - 2⁵ = 21730263701 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21730263692 and 21730263701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21730263773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1708218 + ... + 1720891.

It is an arithmetic number, because the mean of its divisors is an integer number (5433424795).

Almost surely, 2^21730263733 is an apocalyptic number.

It is an amenable number.

21730263733 is a deficient number, since it is larger than the sum of its proper divisors (3435447).

21730263733 is an equidigital number, since it uses as much as digits as its factorization.

21730263733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3435446.

The product of its (nonzero) digits is 95256, while the sum is 37.

The spelling of 21730263733 in words is "twenty-one billion, seven hundred thirty million, two hundred sixty-three thousand, seven hundred thirty-three".