21275116022166 has 128 divisors (see below), whose sum is σ = 45310059970560. Its totient is φ = 6645318451200.

The previous prime is 21275116022077. The next prime is 21275116022179. The reversal of 21275116022166 is 66122061157212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2479323996 + ... + 2479332576.

It is an arithmetic number, because the mean of its divisors is an integer number (353984843520).

Almost surely, 2^{21275116022166} is an apocalyptic number.

21275116022166 is an abundant number, since it is smaller than the sum of its proper divisors (24034943948394).

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

21275116022166 is a wasteful number, since it uses less digits than its factorization.

21275116022166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9822.

The product of its (nonzero) digits is 120960, while the sum is 42.

Adding to 21275116022166 its reverse (66122061157212), we get a palindrome (87397177179378).

The spelling of 21275116022166 in words is "twenty-one trillion, two hundred seventy-five billion, one hundred sixteen million, twenty-two thousand, one hundred sixty-six".