245010021 has 4 divisors (see below), whose sum is σ = 326680032. Its totient is φ = 163340012.

The previous prime is 245009983. The next prime is 245010023. The reversal of 245010021 is 120010542.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 245010021 - 2⁹ = 245009509 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245010023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40835001 + ... + 40835006.

It is an arithmetic number, because the mean of its divisors is an integer number (81670008).

Almost surely, 2^245010021 is an apocalyptic number.

It is an amenable number.

245010021 is a deficient number, since it is larger than the sum of its proper divisors (81670011).

245010021 is an equidigital number, since it uses as much as digits as its factorization.

245010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81670010.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 245010021 is about 15652.7959483282. The cubic root of 245010021 is about 625.7410056964.

Adding to 245010021 its reverse (120010542), we get a palindrome (365020563).

The spelling of 245010021 in words is "two hundred forty-five million, ten thousand, twenty-one".