245624021 has 16 divisors (see below), whose sum is σ = 257921280. Its totient is φ = 233716800.

The previous prime is 245624017. The next prime is 245624023. The reversal of 245624021 is 120426542.

It is a cyclic number.

It is not a de Polignac number, because 245624021 - 2² = 245624017 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 (245624023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279635 + ... + 280511.

It is an arithmetic number, because the mean of its divisors is an integer number (16120080).

Almost surely, 2^245624021 is an apocalyptic number.

It is an amenable number.

245624021 is a deficient number, since it is larger than the sum of its proper divisors (12297259).

245624021 is a wasteful number, since it uses less digits than its factorization.

245624021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 245624021 is about 15672.3967854314. The cubic root of 245624021 is about 626.2632761464.

The spelling of 245624021 in words is "two hundred forty-five million, six hundred twenty-four thousand, twenty-one".