21415336652166 has 16 divisors (see below), whose sum is σ = 42830834647104. Its totient is φ = 7138418660264.

The previous prime is 21415336652131. The next prime is 21415336652189. The reversal of 21415336652166 is 66125663351412.

It is a happy number.

It is a congruent number.

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, 4961616 + ... + 8212691.

It is an arithmetic number, because the mean of its divisors is an integer number (2676927165444).

Almost surely, 2^{21415336652166} is an apocalyptic number.

21415336652166 is an abundant number, since it is smaller than the sum of its proper divisors (21415497994938).

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

21415336652166 is a wasteful number, since it uses less digits than its factorization.

21415336652166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13445235.

The product of its digits is 4665600, while the sum is 51.

The spelling of 21415336652166 in words is "twenty-one trillion, four hundred fifteen billion, three hundred thirty-six million, six hundred fifty-two thousand, one hundred sixty-six".