21827556036 has 72 divisors (see below), whose sum is σ = 64821242304. Its totient is φ = 6105608640.

The previous prime is 21827556013. The next prime is 21827556067. The reversal of 21827556036 is 63065572812.

21827556036 is a `hidden beast` number, since 2 + 1 + 82 + 7 + 5 + 560 + 3 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21827555982 and 21827556000.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2114856 + ... + 2125151.

It is an arithmetic number, because the mean of its divisors is an integer number (900295032).

Almost surely, 2^21827556036 is an apocalyptic number.

21827556036 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21827556036 is an abundant number, since it is smaller than the sum of its proper divisors (42993686268).

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

21827556036 is a wasteful number, since it uses less digits than its factorization.

21827556036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4240041 (or 4240036 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 21827556036 in words is "twenty-one billion, eight hundred twenty-seven million, five hundred fifty-six thousand, thirty-six".