21660550416036 has 72 divisors (see below), whose sum is σ = 62588985286464. Its totient is φ = 6187337956800.

The previous prime is 21660550416031. The next prime is 21660550416053. The reversal of 21660550416036 is 63061405506612.

21660550416036 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 0 + 550 + 4 + 1 + 60 + 36 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21660550415982 and 21660550416000.

It is not an unprimeable number, because it can be changed into a prime (21660550416031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8533995 + ... + 10777298.

It is an arithmetic number, because the mean of its divisors is an integer number (869291462312).

Almost surely, 2^{21660550416036} is an apocalyptic number.

It is an amenable number.

21660550416036 is an abundant number, since it is smaller than the sum of its proper divisors (40928434870428).

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

21660550416036 is a wasteful number, since it uses less digits than its factorization.

21660550416036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19315761 (or 19315756 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 21660550416036 in words is "twenty-one trillion, six hundred sixty billion, five hundred fifty million, four hundred sixteen thousand, thirty-six".