21523659752 has 16 divisors (see below), whose sum is σ = 46122128160. Its totient is φ = 9224425584.

The previous prime is 21523659749. The next prime is 21523659757. The reversal of 21523659752 is 25795632512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21523659697 and 21523659706.

It is not an unprimeable number, because it can be changed into a prime (21523659757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192175478 + ... + 192175589.

It is an arithmetic number, because the mean of its divisors is an integer number (2882633010).

Almost surely, 2^21523659752 is an apocalyptic number.

It is an amenable number.

21523659752 is an abundant number, since it is smaller than the sum of its proper divisors (24598468408).

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

21523659752 is a wasteful number, since it uses less digits than its factorization.

21523659752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384351080 (or 384351076 counting only the distinct ones).

The product of its digits is 1134000, while the sum is 47.

The spelling of 21523659752 in words is "twenty-one billion, five hundred twenty-three million, six hundred fifty-nine thousand, seven hundred fifty-two".