221440513 has 4 divisors (see below), whose sum is σ = 253074880. Its totient is φ = 189806148.

The previous prime is 221440507. The next prime is 221440517. The reversal of 221440513 is 315044122.

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.

It is not a de Polignac number, because 221440513 - 2²⁵ = 187886081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221440517) 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, 15817173 + ... + 15817186.

It is an arithmetic number, because the mean of its divisors is an integer number (63268720).

Almost surely, 2^221440513 is an apocalyptic number.

It is an amenable number.

221440513 is a deficient number, since it is larger than the sum of its proper divisors (31634367).

221440513 is an equidigital number, since it uses as much as digits as its factorization.

221440513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31634366.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 221440513 is about 14880.8774270874. The cubic root of 221440513 is about 604.9957998934.

Adding to 221440513 its reverse (315044122), we get a palindrome (536484635).

The spelling of 221440513 in words is "two hundred twenty-one million, four hundred forty thousand, five hundred thirteen".