21486091474544 has 20 divisors (see below), whose sum is σ = 41630587655640. Its totient is φ = 10742714015040.

The previous prime is 21486091474543. The next prime is 21486091474553. The reversal of 21486091474544 is 44547419068412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21486091474543) 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 3 ways as a sum of consecutive naturals, for example, 20197859 + ... + 21235010.

It is an arithmetic number, because the mean of its divisors is an integer number (2081529382782).

Almost surely, 2^{21486091474544} is an apocalyptic number.

It is an amenable number.

21486091474544 is a deficient number, since it is larger than the sum of its proper divisors (20144496181096).

21486091474544 is a wasteful number, since it uses less digits than its factorization.

21486091474544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41465288 (or 41465282 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 59.

The spelling of 21486091474544 in words is "twenty-one trillion, four hundred eighty-six billion, ninety-one million, four hundred seventy-four thousand, five hundred forty-four".