21243364274 has 16 divisors (see below), whose sum is σ = 35049161376. Its totient is φ = 9656073460.

The previous prime is 21243364273. The next prime is 21243364277. The reversal of 21243364274 is 47246334212.

It is not an unprimeable number, because it can be changed into a prime (21243364273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3987452 + ... + 3992775.

It is an arithmetic number, because the mean of its divisors is an integer number (2190572586).

Almost surely, 2^21243364274 is an apocalyptic number.

21243364274 is a deficient number, since it is larger than the sum of its proper divisors (13805797102).

21243364274 is an equidigital number, since it uses as much as digits as its factorization.

21243364274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7980262 (or 7980240 counting only the distinct ones).

The product of its digits is 193536, while the sum is 38.

Adding to 21243364274 its reverse (47246334212), we get a palindrome (68489698486).

The spelling of 21243364274 in words is "twenty-one billion, two hundred forty-three million, three hundred sixty-four thousand, two hundred seventy-four".