221412245 has 16 divisors (see below), whose sum is σ = 277398000. Its totient is φ = 169440768.

The previous prime is 221412241. The next prime is 221412251. The reversal of 221412245 is 542214122.

It can be written as a sum of positive squares in 8 ways, for example, as 8427409 + 212984836 = 2903^2 + 14594^2 .

It is a cyclic number.

It is not a de Polignac number, because 221412245 - 2² = 221412241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221412245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221412241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8801 + ... + 22809.

It is an arithmetic number, because the mean of its divisors is an integer number (17337375).

Almost surely, 2^221412245 is an apocalyptic number.

It is an amenable number.

221412245 is a deficient number, since it is larger than the sum of its proper divisors (55985755).

221412245 is a wasteful number, since it uses less digits than its factorization.

221412245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14152.

The product of its digits is 1280, while the sum is 23.

The square root of 221412245 is about 14879.9275871894. The cubic root of 221412245 is about 604.9700552080.

Adding to 221412245 its reverse (542214122), we get a palindrome (763626367).

The spelling of 221412245 in words is "two hundred twenty-one million, four hundred twelve thousand, two hundred forty-five".