21001033168266 has 16 divisors (see below), whose sum is σ = 42037038929088. Its totient is φ = 6994515624000.

The previous prime is 21001033168229. The next prime is 21001033168273. The reversal of 21001033168266 is 66286133010012.

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, 1457183550 + ... + 1457197961.

It is an arithmetic number, because the mean of its divisors is an integer number (2627314933068).

Almost surely, 2^{21001033168266} is an apocalyptic number.

21001033168266 is an abundant number, since it is smaller than the sum of its proper divisors (21036005760822).

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

21001033168266 is a wasteful number, since it uses less digits than its factorization.

21001033168266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2914382717.

The product of its (nonzero) digits is 62208, while the sum is 39.

Adding to 21001033168266 its reverse (66286133010012), we get a palindrome (87287166178278).

The spelling of 21001033168266 in words is "twenty-one trillion, one billion, thirty-three million, one hundred sixty-eight thousand, two hundred sixty-six".