221600057 has 4 divisors (see below), whose sum is σ = 253257216. Its totient is φ = 189942900.

The previous prime is 221600053. The next prime is 221600063. The reversal of 221600057 is 750006122.

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 not a de Polignac number, because 221600057 - 2² = 221600053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221600051) 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, 15828569 + ... + 15828582.

It is an arithmetic number, because the mean of its divisors is an integer number (63314304).

Almost surely, 2^221600057 is an apocalyptic number.

It is an amenable number.

221600057 is a deficient number, since it is larger than the sum of its proper divisors (31657159).

221600057 is an equidigital number, since it uses as much as digits as its factorization.

221600057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31657158.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 221600057 is about 14886.2371672629. The cubic root of 221600057 is about 605.1410612953.

Adding to 221600057 its reverse (750006122), we get a palindrome (971606179).

The spelling of 221600057 in words is "two hundred twenty-one million, six hundred thousand, fifty-seven".