21751754833 has 4 divisors (see below), whose sum is σ = 22697483328. Its totient is φ = 20806026340.

The previous prime is 21751754807. The next prime is 21751754839. The reversal of 21751754833 is 33845715712.

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 a de Polignac number, because none of the positive numbers 2^k-21751754833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21751754839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472864213 + ... + 472864258.

It is an arithmetic number, because the mean of its divisors is an integer number (5674370832).

Almost surely, 2^21751754833 is an apocalyptic number.

21751754833 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21751754833 is a deficient number, since it is larger than the sum of its proper divisors (945728495).

21751754833 is an equidigital number, since it uses as much as digits as its factorization.

21751754833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945728494.

The product of its digits is 705600, while the sum is 46.

The spelling of 21751754833 in words is "twenty-one billion, seven hundred fifty-one million, seven hundred fifty-four thousand, eight hundred thirty-three".