245021 has 16 divisors (see below), whose sum is σ = 311040. Its totient is φ = 188160.

The previous prime is 244997. The next prime is 245023. The reversal of 245021 is 120542.

It is not a de Polignac number, because 245021 - 2⁶ = 244957 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 244987 and 245005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3416 + ... + 3486.

It is an arithmetic number, because the mean of its divisors is an integer number (19440).

2²⁴⁵⁰²¹ is an apocalyptic number.

It is an amenable number.

245021 is a deficient number, since it is larger than the sum of its proper divisors (66019).

245021 is a wasteful number, since it uses less digits than its factorization.

245021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 245021 is about 494.9959595795. The cubic root of 245021 is about 62.5750352128.

Adding to 245021 its reverse (120542), we get a palindrome (365563).

The spelling of 245021 in words is "two hundred forty-five thousand, twenty-one".