2216588666021 has 4 divisors (see below), whose sum is σ = 2217804569472. Its totient is φ = 2215372762572.

The previous prime is 2216588665997. The next prime is 2216588666041. The reversal of 2216588666021 is 1206668856122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2216588666021 - 2¹⁴ = 2216588649637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216588666041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607948991 + ... + 607952636.

It is an arithmetic number, because the mean of its divisors is an integer number (554451142368).

Almost surely, 2^{2216588666021} is an apocalyptic number.

It is an amenable number.

2216588666021 is a deficient number, since it is larger than the sum of its proper divisors (1215903451).

2216588666021 is a wasteful number, since it uses less digits than its factorization.

2216588666021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215903450.

The product of its (nonzero) digits is 3317760, while the sum is 53.

The spelling of 2216588666021 in words is "two trillion, two hundred sixteen billion, five hundred eighty-eight million, six hundred sixty-six thousand, twenty-one".