221666711070211 has 8 divisors (see below), whose sum is σ = 249618818331648. Its totient is φ = 195014701821000.

The previous prime is 221666711070179. The next prime is 221666711070229. The reversal of 221666711070211 is 112070117666122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221666711070211 - 2⁵ = 221666711070179 is a prime.

It is a super-2 number, since 2×221666711070211² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221666711070611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325024502695 + ... + 325024503376.

It is an arithmetic number, because the mean of its divisors is an integer number (31202352291456).

Almost surely, 2^{221666711070211} is an apocalyptic number.

221666711070211 is a deficient number, since it is larger than the sum of its proper divisors (27952107261437).

221666711070211 is a wasteful number, since it uses less digits than its factorization.

221666711070211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650049006113.

The product of its (nonzero) digits is 84672, while the sum is 43.

The spelling of 221666711070211 in words is "two hundred twenty-one trillion, six hundred sixty-six billion, seven hundred eleven million, seventy thousand, two hundred eleven".