221650568057 has 4 divisors (see below), whose sum is σ = 221937309540. Its totient is φ = 221363826576.

The previous prime is 221650568033. The next prime is 221650568059. The reversal of 221650568057 is 750865056122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 750865056122 = 2 ⋅375432528061.

It can be written as a sum of positive squares in 2 ways, for example, as 124513002496 + 97137565561 = 352864^2 + 311669^2 .

It is a cyclic number.

It is not a de Polignac number, because 221650568057 - 2¹² = 221650563961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221650568059) 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, 143369582 + ... + 143371127.

It is an arithmetic number, because the mean of its divisors is an integer number (55484327385).

Almost surely, 2^221650568057 is an apocalyptic number.

It is an amenable number.

221650568057 is a deficient number, since it is larger than the sum of its proper divisors (286741483).

221650568057 is an equidigital number, since it uses as much as digits as its factorization.

221650568057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286741482.

The product of its (nonzero) digits is 1008000, while the sum is 47.

The spelling of 221650568057 in words is "two hundred twenty-one billion, six hundred fifty million, five hundred sixty-eight thousand, fifty-seven".