21121311304 has 16 divisors (see below), whose sum is σ = 39904769520. Its totient is φ = 10480039440.

The previous prime is 21121311191. The next prime is 21121311307. The reversal of 21121311304 is 40311312112.

It is a super-2 number, since 2×21121311304² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121311307) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10075914 + ... + 10078009.

It is an arithmetic number, because the mean of its divisors is an integer number (2494048095).

Almost surely, 2^21121311304 is an apocalyptic number.

It is an amenable number.

21121311304 is a deficient number, since it is larger than the sum of its proper divisors (18783458216).

21121311304 is a wasteful number, since it uses less digits than its factorization.

21121311304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20154060 (or 20154056 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21121311304 its reverse (40311312112), we get a palindrome (61432623416).

The spelling of 21121311304 in words is "twenty-one billion, one hundred twenty-one million, three hundred eleven thousand, three hundred four".