21943639850495 has 16 divisors (see below), whose sum is σ = 28902453927552. Its totient is φ = 15861102752160.

The previous prime is 21943639850471. The next prime is 21943639850563. The reversal of 21943639850495 is 59405893634912.

It is not a de Polignac number, because 21943639850495 - 2¹² = 21943639846399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1223841557 + ... + 1223859486.

It is an arithmetic number, because the mean of its divisors is an integer number (1806403370472).

Almost surely, 2^{21943639850495} is an apocalyptic number.

21943639850495 is a deficient number, since it is larger than the sum of its proper divisors (6958814077057).

21943639850495 is a wasteful number, since it uses less digits than its factorization.

21943639850495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2447701222.

The product of its (nonzero) digits is 251942400, while the sum is 68.

The spelling of 21943639850495 in words is "twenty-one trillion, nine hundred forty-three billion, six hundred thirty-nine million, eight hundred fifty thousand, four hundred ninety-five".