221710057 has 4 divisors (see below), whose sum is σ = 222593616. Its totient is φ = 220826500.

The previous prime is 221710043. The next prime is 221710061. The reversal of 221710057 is 750017122.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 750017122 = 2 ⋅375008561.

It is a cyclic number.

It is not a de Polignac number, because 221710057 - 2¹¹ = 221708009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221710037) 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, 441403 + ... + 441904.

It is an arithmetic number, because the mean of its divisors is an integer number (55648404).

Almost surely, 2^221710057 is an apocalyptic number.

It is an amenable number.

221710057 is a deficient number, since it is larger than the sum of its proper divisors (883559).

221710057 is an equidigital number, since it uses as much as digits as its factorization.

221710057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883558.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 221710057 is about 14889.9313967526. The cubic root of 221710057 is about 605.2411733418.

Adding to 221710057 its reverse (750017122), we get a palindrome (971727179).

The spelling of 221710057 in words is "two hundred twenty-one million, seven hundred ten thousand, fifty-seven".