221675473 has 4 divisors (see below), whose sum is σ = 227666740. Its totient is φ = 215684208.

The previous prime is 221675471. The next prime is 221675491. The reversal of 221675473 is 374576122.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 154057744 + 67617729 = 12412^2 + 8223^2 .

It is a cyclic number.

It is not a de Polignac number, because 221675473 - 2¹ = 221675471 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 5991229 = 221675473 / (2 + 2 + 1 + 6 + 7 + 5 + 4 + 7 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221675471) 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, 2995578 + ... + 2995651.

It is an arithmetic number, because the mean of its divisors is an integer number (56916685).

Almost surely, 2^221675473 is an apocalyptic number.

It is an amenable number.

221675473 is a deficient number, since it is larger than the sum of its proper divisors (5991267).

221675473 is an equidigital number, since it uses as much as digits as its factorization.

221675473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5991266.

The product of its digits is 70560, while the sum is 37.

The square root of 221675473 is about 14888.7700297909. The cubic root of 221675473 is about 605.2097016839.

The spelling of 221675473 in words is "two hundred twenty-one million, six hundred seventy-five thousand, four hundred seventy-three".