21356140052166 has 16 divisors (see below), whose sum is σ = 42760982828784. Its totient is φ = 7110596229984.

The previous prime is 21356140052087. The next prime is 21356140052207. The reversal of 21356140052166 is 66125004165312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2029274485 + ... + 2029285008.

It is an arithmetic number, because the mean of its divisors is an integer number (2672561426799).

Almost surely, 2^{21356140052166} is an apocalyptic number.

21356140052166 is an abundant number, since it is smaller than the sum of its proper divisors (21404842776618).

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

21356140052166 is a wasteful number, since it uses less digits than its factorization.

21356140052166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4058560375.

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 21356140052166 in words is "twenty-one trillion, three hundred fifty-six billion, one hundred forty million, fifty-two thousand, one hundred sixty-six".