21320554079 has 8 divisors (see below), whose sum is σ = 24009070080. Its totient is φ = 18757085400.

The previous prime is 21320554039. The next prime is 21320554091. The reversal of 21320554079 is 97045502312.

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 21320554079 - 2¹⁶ = 21320488543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320554039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31261469 + ... + 31262150.

It is an arithmetic number, because the mean of its divisors is an integer number (3001133760).

Almost surely, 2^21320554079 is an apocalyptic number.

21320554079 is a deficient number, since it is larger than the sum of its proper divisors (2688516001).

21320554079 is a wasteful number, since it uses less digits than its factorization.

21320554079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62523661.

The product of its (nonzero) digits is 75600, while the sum is 38.

The spelling of 21320554079 in words is "twenty-one billion, three hundred twenty million, five hundred fifty-four thousand, seventy-nine".