221480521 has 4 divisors (see below), whose sum is σ = 223171344. Its totient is φ = 219789700.

The previous prime is 221480503. The next prime is 221480527. The reversal of 221480521 is 125084122.

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: 125084122 = 2 ⋅62542061.

It is a cyclic number.

It is not a de Polignac number, because 221480521 - 2⁵ = 221480489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221480527) 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, 845215 + ... + 845476.

It is an arithmetic number, because the mean of its divisors is an integer number (55792836).

Almost surely, 2^221480521 is an apocalyptic number.

It is an amenable number.

221480521 is a deficient number, since it is larger than the sum of its proper divisors (1690823).

221480521 is a wasteful number, since it uses less digits than its factorization.

221480521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690822.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 221480521 is about 14882.2216419458. The cubic root of 221480521 is about 605.0322328750.

The spelling of 221480521 in words is "two hundred twenty-one million, four hundred eighty thousand, five hundred twenty-one".