21531004333104 has 120 divisors (see below), whose sum is σ = 64705764066048. Its totient is φ = 6151439898240.

The previous prime is 21531004333103. The next prime is 21531004333133. The reversal of 21531004333104 is 40133340013512.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21531004333103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55518589 + ... + 55905059.

Almost surely, 2^{21531004333104} is an apocalyptic number.

21531004333104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21531004333104 is an abundant number, since it is smaller than the sum of its proper divisors (43174759732944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21531004333104 is a wasteful number, since it uses less digits than its factorization.

21531004333104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410183 (or 410170 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

Adding to 21531004333104 its reverse (40133340013512), we get a palindrome (61664344346616).

The spelling of 21531004333104 in words is "twenty-one trillion, five hundred thirty-one billion, four million, three hundred thirty-three thousand, one hundred four".