21584974245 has 32 divisors (see below), whose sum is σ = 35210132352. Its totient is φ = 11287540992.

The previous prime is 21584974189. The next prime is 21584974247. The reversal of 21584974245 is 54247948512.

It is a happy number.

It is not a de Polignac number, because 21584974245 - 2⁹ = 21584973733 is a prime.

It is a super-2 number, since 2×21584974245² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21584974247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1369902 + ... + 1385568.

It is an arithmetic number, because the mean of its divisors is an integer number (1100316636).

Almost surely, 2^21584974245 is an apocalyptic number.

It is an amenable number.

21584974245 is a deficient number, since it is larger than the sum of its proper divisors (13625158107).

21584974245 is a wasteful number, since it uses less digits than its factorization.

21584974245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17461.

The product of its digits is 3225600, while the sum is 51.

The spelling of 21584974245 in words is "twenty-one billion, five hundred eighty-four million, nine hundred seventy-four thousand, two hundred forty-five".