21113523512 has 8 divisors (see below), whose sum is σ = 39587856600. Its totient is φ = 10556761752.

The previous prime is 21113523511. The next prime is 21113523521. The reversal of 21113523512 is 21532531112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113523511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319595212 + ... + 1319595227.

It is an arithmetic number, because the mean of its divisors is an integer number (4948482075).

Almost surely, 2^21113523512 is an apocalyptic number.

It is an amenable number.

21113523512 is a deficient number, since it is larger than the sum of its proper divisors (18474333088).

21113523512 is a wasteful number, since it uses less digits than its factorization.

21113523512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2639190445 (or 2639190441 counting only the distinct ones).

The product of its digits is 1800, while the sum is 26.

The spelling of 21113523512 in words is "twenty-one billion, one hundred thirteen million, five hundred twenty-three thousand, five hundred twelve".