245231021 has 12 divisors (see below), whose sum is σ = 286948512. Its totient is φ = 205298856.

The previous prime is 245231009. The next prime is 245231033. The reversal of 245231021 is 120132542.

It is an interprime number because it is at equal distance from previous prime (245231009) and next prime (245231033).

It is not a de Polignac number, because 245231021 - 2¹⁰ = 245229997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 245230984 and 245231002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245231071) 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 11 ways as a sum of consecutive naturals, for example, 3470 + ... + 22416.

It is an arithmetic number, because the mean of its divisors is an integer number (23912376).

Almost surely, 2^245231021 is an apocalyptic number.

It is an amenable number.

245231021 is a deficient number, since it is larger than the sum of its proper divisors (41717491).

245231021 is an equidigital number, since it uses as much as digits as its factorization.

245231021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19040 (or 18997 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 245231021 is about 15659.8537988067. The cubic root of 245231021 is about 625.9290894375.

Adding to 245231021 its reverse (120132542), we get a palindrome (365363563).

The spelling of 245231021 in words is "two hundred forty-five million, two hundred thirty-one thousand, twenty-one".