21274440506 has 16 divisors (see below), whose sum is σ = 34821003168. Its totient is φ = 9667899600.

The previous prime is 21274440493. The next prime is 21274440553. The reversal of 21274440506 is 60504447212.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18665 + ... + 207116.

It is an arithmetic number, because the mean of its divisors is an integer number (2176312698).

Almost surely, 2^21274440506 is an apocalyptic number.

21274440506 is a deficient number, since it is larger than the sum of its proper divisors (13546562662).

21274440506 is a wasteful number, since it uses less digits than its factorization.

21274440506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230077.

The product of its (nonzero) digits is 53760, while the sum is 35.

Adding to 21274440506 its reverse (60504447212), we get a palindrome (81778887718).

The spelling of 21274440506 in words is "twenty-one billion, two hundred seventy-four million, four hundred forty thousand, five hundred six".