21331204011 has 32 divisors (see below), whose sum is σ = 35206248000. Its totient is φ = 12674237184.

The previous prime is 21331203983. The next prime is 21331204033. The reversal of 21331204011 is 11040213312.

21331204011 is a `hidden beast` number, since 213 + 31 + 20 + 401 + 1 = 666.

It is not a de Polignac number, because 21331204011 - 2⁵ = 21331203979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21331204061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1037626 + ... + 1057983.

It is an arithmetic number, because the mean of its divisors is an integer number (1100195250).

Almost surely, 2^21331204011 is an apocalyptic number.

21331204011 is a deficient number, since it is larger than the sum of its proper divisors (13875043989).

21331204011 is a wasteful number, since it uses less digits than its factorization.

21331204011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2095660 (or 2095654 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21331204011 its reverse (11040213312), we get a palindrome (32371417323).

The spelling of 21331204011 in words is "twenty-one billion, three hundred thirty-one million, two hundred four thousand, eleven".