221124745 has 8 divisors (see below), whose sum is σ = 270356616. Its totient is φ = 173561856.

The previous prime is 221124727. The next prime is 221124749. The reversal of 221124745 is 547421122.

It can be written as a sum of positive squares in 4 ways, for example, as 24760576 + 196364169 = 4976^2 + 14013^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221124745 - 2¹¹ = 221122697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221124749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 416952 + ... + 417481.

It is an arithmetic number, because the mean of its divisors is an integer number (33794577).

Almost surely, 2^221124745 is an apocalyptic number.

It is an amenable number.

221124745 is a deficient number, since it is larger than the sum of its proper divisors (49231871).

221124745 is an equidigital number, since it uses as much as digits as its factorization.

221124745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834491.

The product of its digits is 4480, while the sum is 28.

The square root of 221124745 is about 14870.2637838069. The cubic root of 221124745 is about 604.7080940467.

Adding to 221124745 its reverse (547421122), we get a palindrome (768545867).

The spelling of 221124745 in words is "two hundred twenty-one million, one hundred twenty-four thousand, seven hundred forty-five".