21371013105547 has 24 divisors (see below), whose sum is σ = 25694990608896. Its totient is φ = 17712262946448.

The previous prime is 21371013105529. The next prime is 21371013105581. The reversal of 21371013105547 is 74550131017312.

It is a happy number.

It is not a de Polignac number, because 21371013105547 - 2¹¹ = 21371013103499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21371013108547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55710303 + ... + 56092600.

It is an arithmetic number, because the mean of its divisors is an integer number (1070624608704).

Almost surely, 2^{21371013105547} is an apocalyptic number.

21371013105547 is a deficient number, since it is larger than the sum of its proper divisors (4323977503349).

21371013105547 is a wasteful number, since it uses less digits than its factorization.

21371013105547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111803047 (or 111803040 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 40.

The spelling of 21371013105547 in words is "twenty-one trillion, three hundred seventy-one billion, thirteen million, one hundred five thousand, five hundred forty-seven".