21845456371 has 16 divisors (see below), whose sum is σ = 23647368960. Its totient is φ = 20132098560.

The previous prime is 21845456351. The next prime is 21845456387. The reversal of 21845456371 is 17365454812.

It is a cyclic number.

It is not a de Polignac number, because 21845456371 - 2¹³ = 21845448179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21845456351) 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 15 ways as a sum of consecutive naturals, for example, 100810 + ... + 232063.

It is an arithmetic number, because the mean of its divisors is an integer number (1477960560).

Almost surely, 2^21845456371 is an apocalyptic number.

21845456371 is a deficient number, since it is larger than the sum of its proper divisors (1801912589).

21845456371 is a wasteful number, since it uses less digits than its factorization.

21845456371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333006.

The product of its digits is 806400, while the sum is 46.

The spelling of 21845456371 in words is "twenty-one billion, eight hundred forty-five million, four hundred fifty-six thousand, three hundred seventy-one".