245465221 has 4 divisors (see below), whose sum is σ = 245518444. Its totient is φ = 245412000.

The previous prime is 245465197. The next prime is 245465239. The reversal of 245465221 is 122564542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122564542 = 2 ⋅61282271.

It can be written as a sum of positive squares in 2 ways, for example, as 60233121 + 185232100 = 7761^2 + 13610^2 .

It is a cyclic number.

It is not a de Polignac number, because 245465221 - 2¹⁷ = 245334149 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 (245465291) 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, 18960 + ... + 29161.

It is an arithmetic number, because the mean of its divisors is an integer number (61379611).

Almost surely, 2^245465221 is an apocalyptic number.

It is an amenable number.

245465221 is a deficient number, since it is larger than the sum of its proper divisors (53223).

245465221 is an equidigital number, since it uses as much as digits as its factorization.

245465221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53222.

The product of its digits is 19200, while the sum is 31.

The square root of 245465221 is about 15667.3297341953. The cubic root of 245465221 is about 626.1282838552.

The spelling of 245465221 in words is "two hundred forty-five million, four hundred sixty-five thousand, two hundred twenty-one".