245223021 has 4 divisors (see below), whose sum is σ = 326964032. Its totient is φ = 163482012.

The previous prime is 245223007. The next prime is 245223059. The reversal of 245223021 is 120322542.

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 not a de Polignac number, because 245223021 - 2⁷ = 245222893 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 (245223061) 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, 40870501 + ... + 40870506.

It is an arithmetic number, because the mean of its divisors is an integer number (81741008).

Almost surely, 2^245223021 is an apocalyptic number.

It is an amenable number.

245223021 is a deficient number, since it is larger than the sum of its proper divisors (81741011).

245223021 is an equidigital number, since it uses as much as digits as its factorization.

245223021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81741010.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 245223021 is about 15659.5983664971. The cubic root of 245223021 is about 625.9222829479.

Adding to 245223021 its reverse (120322542), we get a palindrome (365545563).

The spelling of 245223021 in words is "two hundred forty-five million, two hundred twenty-three thousand, twenty-one".