21331243604 has 12 divisors (see below), whose sum is σ = 40723283328. Its totient is φ = 9696019800.

The previous prime is 21331243603. The next prime is 21331243607. The reversal of 21331243604 is 40634213312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331243603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242400452 + ... + 242400539.

It is an arithmetic number, because the mean of its divisors is an integer number (3393606944).

Almost surely, 2^21331243604 is an apocalyptic number.

It is an amenable number.

21331243604 is a deficient number, since it is larger than the sum of its proper divisors (19392039724).

21331243604 is a wasteful number, since it uses less digits than its factorization.

21331243604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484801006 (or 484801004 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 21331243604 its reverse (40634213312), we get a palindrome (61965456916).

The spelling of 21331243604 in words is "twenty-one billion, three hundred thirty-one million, two hundred forty-three thousand, six hundred four".