21544471055386 has 16 divisors (see below), whose sum is σ = 32418613382400. Its totient is φ = 10738315158480.

The previous prime is 21544471055347. The next prime is 21544471055453. The reversal of 21544471055386 is 68355017444512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11252961 + ... + 13027588.

It is an arithmetic number, because the mean of its divisors is an integer number (2026163336400).

Almost surely, 2^{21544471055386} is an apocalyptic number.

21544471055386 is a deficient number, since it is larger than the sum of its proper divisors (10874142327014).

21544471055386 is a wasteful number, since it uses less digits than its factorization.

21544471055386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24281949.

The product of its (nonzero) digits is 16128000, while the sum is 55.

Adding to 21544471055386 its reverse (68355017444512), we get a palindrome (89899488499898).

The spelling of 21544471055386 in words is "twenty-one trillion, five hundred forty-four billion, four hundred seventy-one million, fifty-five thousand, three hundred eighty-six".