21487485574 has 32 divisors (see below), whose sum is σ = 33181376256. Its totient is φ = 10429793280.

The previous prime is 21487485571. The next prime is 21487485583. The reversal of 21487485574 is 47558478412.

It is a happy number.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21487485571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21551644 + ... + 21552640.

It is an arithmetic number, because the mean of its divisors is an integer number (1036918008).

Almost surely, 2^21487485574 is an apocalyptic number.

21487485574 is a deficient number, since it is larger than the sum of its proper divisors (11693890682).

21487485574 is a wasteful number, since it uses less digits than its factorization.

21487485574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080.

The product of its digits is 10035200, while the sum is 55.

The spelling of 21487485574 in words is "twenty-one billion, four hundred eighty-seven million, four hundred eighty-five thousand, five hundred seventy-four".