21311003204 has 6 divisors (see below), whose sum is σ = 37294255614. Its totient is φ = 10655501600.

The previous prime is 21311003149. The next prime is 21311003221. The reversal of 21311003204 is 40230011312.

It can be written as a sum of positive squares in only one way, i.e., 19555225600 + 1755777604 = 139840^2 + 41902^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2663875397 + ... + 2663875404.

It is an arithmetic number, because the mean of its divisors is an integer number (6215709269).

Almost surely, 2^21311003204 is an apocalyptic number.

It is an amenable number.

21311003204 is a deficient number, since it is larger than the sum of its proper divisors (15983252410).

21311003204 is a wasteful number, since it uses less digits than its factorization.

21311003204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5327750805 (or 5327750803 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21311003204 its reverse (40230011312), we get a palindrome (61541014516).

The spelling of 21311003204 in words is "twenty-one billion, three hundred eleven million, three thousand, two hundred four".