21830726751 has 4 divisors (see below), whose sum is σ = 29107635672. Its totient is φ = 14553817832.

The previous prime is 21830726737. The next prime is 21830726777. The reversal of 21830726751 is 15762703812.

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

It is a cyclic number.

It is not a de Polignac number, because 21830726751 - 2¹⁰ = 21830725727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21830726651) 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, 3638454456 + ... + 3638454461.

It is an arithmetic number, because the mean of its divisors is an integer number (7276908918).

Almost surely, 2^21830726751 is an apocalyptic number.

21830726751 is a deficient number, since it is larger than the sum of its proper divisors (7276908921).

21830726751 is an equidigital number, since it uses as much as digits as its factorization.

21830726751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7276908920.

The product of its (nonzero) digits is 141120, while the sum is 42.

The spelling of 21830726751 in words is "twenty-one billion, eight hundred thirty million, seven hundred twenty-six thousand, seven hundred fifty-one".