21636363040 has 48 divisors (see below), whose sum is σ = 51328098360. Its totient is φ = 8618618880.

The previous prime is 21636362999. The next prime is 21636363079. The reversal of 21636363040 is 4036363612.

It can be written as a sum of positive squares in 4 ways, for example, as 21596065936 + 40297104 = 146956^2 + 6348^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21636362987 and 21636363005.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241995 + ... + 319114.

Almost surely, 2^21636363040 is an apocalyptic number.

21636363040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21636363040 is an abundant number, since it is smaller than the sum of its proper divisors (29691735320).

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

21636363040 is a wasteful number, since it uses less digits than its factorization.

21636363040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561365 (or 561357 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 34.

The spelling of 21636363040 in words is "twenty-one billion, six hundred thirty-six million, three hundred sixty-three thousand, forty".