245340021 has 8 divisors (see below), whose sum is σ = 333292320. Its totient is φ = 160473872.

The previous prime is 245340019. The next prime is 245340037. The reversal of 245340021 is 120043542.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 245340021 - 2¹ = 245340019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 245340021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245340001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 771351 + ... + 771668.

It is an arithmetic number, because the mean of its divisors is an integer number (41661540).

Almost surely, 2^245340021 is an apocalyptic number.

It is an amenable number.

245340021 is a deficient number, since it is larger than the sum of its proper divisors (87952299).

245340021 is a wasteful number, since it uses less digits than its factorization.

245340021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543075.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 245340021 is about 15663.3336490033. Note that the first 3 decimals coincide. The cubic root of 245340021 is about 626.0218131130.

Adding to 245340021 its reverse (120043542), we get a palindrome (365383563).

The spelling of 245340021 in words is "two hundred forty-five million, three hundred forty thousand, twenty-one".