221051057 has 4 divisors (see below), whose sum is σ = 221145600. Its totient is φ = 220956516.

The previous prime is 221051041. The next prime is 221051059. The reversal of 221051057 is 750150122.

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: 750150122 = 2 ⋅375075061.

It is a cyclic number.

It is not a de Polignac number, because 221051057 - 2⁴ = 221051041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221051059) 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, 43673 + ... + 48470.

It is an arithmetic number, because the mean of its divisors is an integer number (55286400).

Almost surely, 2^221051057 is an apocalyptic number.

It is an amenable number.

221051057 is a deficient number, since it is larger than the sum of its proper divisors (94543).

221051057 is an equidigital number, since it uses as much as digits as its factorization.

221051057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94542.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 221051057 is about 14867.7858808903. The cubic root of 221051057 is about 604.6409152534.

The spelling of 221051057 in words is "two hundred twenty-one million, fifty-one thousand, fifty-seven".