21011656166592 has 112 divisors (see below), whose sum is σ = 68422572701952. Its totient is φ = 5541535687680.

The previous prime is 21011656166591. The next prime is 21011656166609. The reversal of 21011656166592 is 29566165611012.

It is a tau number, because it is divible by the number of its divisors (112).

It is not an unprimeable number, because it can be changed into a prime (21011656166591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 601277634 + ... + 601312577.

It is an arithmetic number, because the mean of its divisors is an integer number (610915827696).

Almost surely, 2^{21011656166592} is an apocalyptic number.

It is an amenable number.

21011656166592 is an abundant number, since it is smaller than the sum of its proper divisors (47410916535360).

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

21011656166592 is a wasteful number, since it uses less digits than its factorization.

21011656166592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202590246 (or 1202590236 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 51.

The spelling of 21011656166592 in words is "twenty-one trillion, eleven billion, six hundred fifty-six million, one hundred sixty-six thousand, five hundred ninety-two".