21133042512 has 40 divisors (see below), whose sum is σ = 54686770656. Its totient is φ = 7032337536.

The previous prime is 21133042453. The next prime is 21133042529. The reversal of 21133042512 is 21524033112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346843 + ... + 403194.

Almost surely, 2^21133042512 is an apocalyptic number.

It is an amenable number.

21133042512 is an abundant number, since it is smaller than the sum of its proper divisors (33553728144).

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

21133042512 is a wasteful number, since it uses less digits than its factorization.

21133042512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750635 (or 750629 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21133042512 its reverse (21524033112), we get a palindrome (42657075624).

The spelling of 21133042512 in words is "twenty-one billion, one hundred thirty-three million, forty-two thousand, five hundred twelve".