21113522124 has 12 divisors (see below), whose sum is σ = 49264884984. Its totient is φ = 7037840704.

The previous prime is 21113522077. The next prime is 21113522153. The reversal of 21113522124 is 42122531112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21113522094 and 21113522103.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879730077 + ... + 879730100.

It is an arithmetic number, because the mean of its divisors is an integer number (4105407082).

Almost surely, 2^21113522124 is an apocalyptic number.

It is an amenable number.

21113522124 is an abundant number, since it is smaller than the sum of its proper divisors (28151362860).

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

21113522124 is a wasteful number, since it uses less digits than its factorization.

21113522124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759460184 (or 1759460182 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The spelling of 21113522124 in words is "twenty-one billion, one hundred thirteen million, five hundred twenty-two thousand, one hundred twenty-four".