221657089 has 4 divisors (see below), whose sum is σ = 221736960. Its totient is φ = 221577220.

The previous prime is 221657087. The next prime is 221657113. The reversal of 221657089 is 980756122.

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: 980756122 = 2 ⋅490378061.

It is a cyclic number.

It is not a de Polignac number, because 221657089 - 2¹ = 221657087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221657087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35617 + ... + 41374.

It is an arithmetic number, because the mean of its divisors is an integer number (55434240).

Almost surely, 2^221657089 is an apocalyptic number.

It is an amenable number.

221657089 is a deficient number, since it is larger than the sum of its proper divisors (79871).

221657089 is an equidigital number, since it uses as much as digits as its factorization.

221657089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79870.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 221657089 is about 14888.1526389274. The cubic root of 221657089 is about 605.1929707956.

The spelling of 221657089 in words is "two hundred twenty-one million, six hundred fifty-seven thousand, eighty-nine".