221641656256199 has 4 divisors (see below), whose sum is σ = 221641747161936. Its totient is φ = 221641565350464.

The previous prime is 221641656256193. The next prime is 221641656256243. The reversal of 221641656256199 is 991652656146122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221641656256199 - 2⁴ = 221641656256183 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 (221641656256193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41691914 + ... + 46706519.

It is an arithmetic number, because the mean of its divisors is an integer number (55410436790484).

Almost surely, 2^{221641656256199} is an apocalyptic number.

221641656256199 is a deficient number, since it is larger than the sum of its proper divisors (90905737).

221641656256199 is an equidigital number, since it uses as much as digits as its factorization.

221641656256199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90905736.

The product of its digits is 83980800, while the sum is 65.

The spelling of 221641656256199 in words is "two hundred twenty-one trillion, six hundred forty-one billion, six hundred fifty-six million, two hundred fifty-six thousand, one hundred ninety-nine".