21350584836 has 36 divisors (see below), whose sum is σ = 61679468032. Its totient is φ = 6100167024.

The previous prime is 21350584817. The next prime is 21350584837. The reversal of 21350584836 is 63848505312.

21350584836 is a `hidden beast` number, since 2 + 1 + 35 + 0 + 584 + 8 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 21350584791 and 21350584800.

It is not an unprimeable number, because it can be changed into a prime (21350584837) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42362020 + ... + 42362523.

Almost surely, 2^21350584836 is an apocalyptic number.

It is an amenable number.

21350584836 is an abundant number, since it is smaller than the sum of its proper divisors (40328883196).

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

21350584836 is a wasteful number, since it uses less digits than its factorization.

21350584836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84724560 (or 84724555 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 21350584836 in words is "twenty-one billion, three hundred fifty million, five hundred eighty-four thousand, eight hundred thirty-six".