245384021 has 2 divisors, whose sum is σ = 245384022. Its totient is φ = 245384020.

The previous prime is 245384017. The next prime is 245384059. The reversal of 245384021 is 120483542.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237622225 + 7761796 = 15415^2 + 2786^2 .

It is a cyclic number.

It is not a de Polignac number, because 245384021 - 2² = 245384017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245384081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122692010 + 122692011.

It is an arithmetic number, because the mean of its divisors is an integer number (122692011).

Almost surely, 2^245384021 is an apocalyptic number.

It is an amenable number.

245384021 is a deficient number, since it is larger than the sum of its proper divisors (1).

245384021 is an equidigital number, since it uses as much as digits as its factorization.

245384021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 245384021 is about 15664.7381401669. The cubic root of 245384021 is about 626.0592350729.

The spelling of 245384021 in words is "two hundred forty-five million, three hundred eighty-four thousand, twenty-one".