245333021 has 4 divisors (see below), whose sum is σ = 245733852. Its totient is φ = 244932192.

The previous prime is 245332987. The next prime is 245333041. The reversal of 245333021 is 120333542.

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 67404100 + 177928921 = 8210^2 + 13339^2 .

It is a cyclic number.

It is not a de Polignac number, because 245333021 - 2¹⁰ = 245331997 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 (245333041) 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, 199496 + ... + 200721.

It is an arithmetic number, because the mean of its divisors is an integer number (61433463).

Almost surely, 2^245333021 is an apocalyptic number.

It is an amenable number.

245333021 is a deficient number, since it is larger than the sum of its proper divisors (400831).

245333021 is an equidigital number, since it uses as much as digits as its factorization.

245333021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400830.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 245333021 is about 15663.1101956157. The cubic root of 245333021 is about 626.0158592069.

Adding to 245333021 its reverse (120333542), we get a palindrome (365666563).

The spelling of 245333021 in words is "two hundred forty-five million, three hundred thirty-three thousand, twenty-one".