21108315528 has 48 divisors (see below), whose sum is σ = 59285706480. Its totient is φ = 7036104528.

The previous prime is 21108315517. The next prime is 21108315551. The reversal of 21108315528 is 82551380112.

21108315528 is a `hidden beast` number, since 2 + 110 + 8 + 3 + 15 + 528 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21108315492 and 21108315501.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5427150 + ... + 5431037.

It is an arithmetic number, because the mean of its divisors is an integer number (1235118885).

Almost surely, 2^21108315528 is an apocalyptic number.

It is an amenable number.

21108315528 is an abundant number, since it is smaller than the sum of its proper divisors (38177390952).

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

21108315528 is a wasteful number, since it uses less digits than its factorization.

21108315528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10858208 (or 10858192 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The spelling of 21108315528 in words is "twenty-one billion, one hundred eight million, three hundred fifteen thousand, five hundred twenty-eight".