221315449 has 4 divisors (see below), whose sum is σ = 224432640. Its totient is φ = 218198260.

The previous prime is 221315429. The next prime is 221315519. The reversal of 221315449 is 944513122.

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 a cyclic number.

It is not a de Polignac number, because 221315449 - 2¹¹ = 221313401 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221315449.

It is not an unprimeable number, because it can be changed into a prime (221315429) 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, 1558489 + ... + 1558630.

It is an arithmetic number, because the mean of its divisors is an integer number (56108160).

Almost surely, 2^221315449 is an apocalyptic number.

It is an amenable number.

221315449 is a deficient number, since it is larger than the sum of its proper divisors (3117191).

221315449 is an equidigital number, since it uses as much as digits as its factorization.

221315449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3117190.

The product of its digits is 8640, while the sum is 31.

The square root of 221315449 is about 14876.6746620339. The cubic root of 221315449 is about 604.8818830038.

The spelling of 221315449 in words is "two hundred twenty-one million, three hundred fifteen thousand, four hundred forty-nine".