245412221 has 4 divisors (see below), whose sum is σ = 259848252. Its totient is φ = 230976192.

The previous prime is 245412179. The next prime is 245412247. The reversal of 245412221 is 122214542.

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 170589721 + 74822500 = 13061^2 + 8650^2 .

It is a cyclic number.

It is not a de Polignac number, because 245412221 - 2¹⁴ = 245395837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245412121) 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, 7217990 + ... + 7218023.

It is an arithmetic number, because the mean of its divisors is an integer number (64962063).

Almost surely, 2^245412221 is an apocalyptic number.

It is an amenable number.

245412221 is a deficient number, since it is larger than the sum of its proper divisors (14436031).

245412221 is a wasteful number, since it uses less digits than its factorization.

245412221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14436030.

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

The square root of 245412221 is about 15665.6382251091. The cubic root of 245412221 is about 626.0832167949.

Adding to 245412221 its reverse (122214542), we get a palindrome (367626763).

It can be divided in two parts, 24541 and 2221, that added together give a palindrome (26762).

The spelling of 245412221 in words is "two hundred forty-five million, four hundred twelve thousand, two hundred twenty-one".