245145021 has 16 divisors (see below), whose sum is σ = 364869120. Its totient is φ = 145116720.

The previous prime is 245145013. The next prime is 245145041. The reversal of 245145021 is 120541542.

It is not a de Polignac number, because 245145021 - 2³ = 245145013 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 245144982 and 245145000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245145001) 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, 84961 + ... + 87798.

It is an arithmetic number, because the mean of its divisors is an integer number (22804320).

Almost surely, 2^245145021 is an apocalyptic number.

It is an amenable number.

245145021 is a deficient number, since it is larger than the sum of its proper divisors (119724099).

245145021 is a wasteful number, since it uses less digits than its factorization.

245145021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172816.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 245145021 is about 15657.1076830940. The cubic root of 245145021 is about 625.8559119153.

Adding to 245145021 its reverse (120541542), we get a palindrome (365686563).

The spelling of 245145021 in words is "two hundred forty-five million, one hundred forty-five thousand, twenty-one".