221257043 has 4 divisors (see below), whose sum is σ = 252865200. Its totient is φ = 189648888.

The previous prime is 221257031. The next prime is 221257063. The reversal of 221257043 is 340752122.

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

It is a cyclic number.

It is not a de Polignac number, because 221257043 - 2⁴ = 221257027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221257063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15804068 + ... + 15804081.

It is an arithmetic number, because the mean of its divisors is an integer number (63216300).

Almost surely, 2^221257043 is an apocalyptic number.

221257043 is a deficient number, since it is larger than the sum of its proper divisors (31608157).

221257043 is an equidigital number, since it uses as much as digits as its factorization.

221257043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31608156.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 221257043 is about 14874.7115266146. The cubic root of 221257043 is about 604.8286681023.

The spelling of 221257043 in words is "two hundred twenty-one million, two hundred fifty-seven thousand, forty-three".