221071057 has 4 divisors (see below), whose sum is σ = 226463076. Its totient is φ = 215679040.

The previous prime is 221071027. The next prime is 221071091. The reversal of 221071057 is 750170122.

It is a happy number.

221071057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 65545216 + 155525841 = 8096^2 + 12471^2 .

It is a cyclic number.

It is not a de Polignac number, because 221071057 - 2¹⁵ = 221038289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221071027) 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, 2695948 + ... + 2696029.

It is an arithmetic number, because the mean of its divisors is an integer number (56615769).

Almost surely, 2^221071057 is an apocalyptic number.

It is an amenable number.

221071057 is a deficient number, since it is larger than the sum of its proper divisors (5392019).

221071057 is an equidigital number, since it uses as much as digits as its factorization.

221071057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5392018.

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

The square root of 221071057 is about 14868.4584607820. The cubic root of 221071057 is about 604.6591500355.

The spelling of 221071057 in words is "two hundred twenty-one million, seventy-one thousand, fifty-seven".