21066576576221 has 32 divisors (see below), whose sum is σ = 23448443977728. Its totient is φ = 18765793823040.

The previous prime is 21066576576217. The next prime is 21066576576223. The reversal of 21066576576221 is 12267567566012.

It is not a de Polignac number, because 21066576576221 - 2² = 21066576576217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21066576576223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105187040 + ... + 105387126.

It is an arithmetic number, because the mean of its divisors is an integer number (732763874304).

Almost surely, 2^{21066576576221} is an apocalyptic number.

It is an amenable number.

21066576576221 is a deficient number, since it is larger than the sum of its proper divisors (2381867401507).

21066576576221 is a wasteful number, since it uses less digits than its factorization.

21066576576221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200921.

The product of its (nonzero) digits is 12700800, while the sum is 56.

The spelling of 21066576576221 in words is "twenty-one trillion, sixty-six billion, five hundred seventy-six million, five hundred seventy-six thousand, two hundred twenty-one".