21864548733 has 4 divisors (see below), whose sum is σ = 29152731648. Its totient is φ = 14576365820.

The previous prime is 21864548723. The next prime is 21864548779. The reversal of 21864548733 is 33784546812.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21864548733 - 2⁵ = 21864548701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21864548723) 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 3 ways as a sum of consecutive naturals, for example, 3644091453 + ... + 3644091458.

It is an arithmetic number, because the mean of its divisors is an integer number (7288182912).

Almost surely, 2^21864548733 is an apocalyptic number.

It is an amenable number.

21864548733 is a deficient number, since it is larger than the sum of its proper divisors (7288182915).

21864548733 is an equidigital number, since it uses as much as digits as its factorization.

21864548733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7288182914.

The product of its digits is 3870720, while the sum is 51.

The spelling of 21864548733 in words is "twenty-one billion, eight hundred sixty-four million, five hundred forty-eight thousand, seven hundred thirty-three".