245005021 has 8 divisors (see below), whose sum is σ = 255159000. Its totient is φ = 234964800.

The previous prime is 245005001. The next prime is 245005051. The reversal of 245005021 is 120500542.

It can be written as a sum of positive squares in 4 ways, for example, as 16088121 + 228916900 = 4011^2 + 15130^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 245005021 - 2²⁷ = 110787293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 245005021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245005001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24030 + ... + 32671.

It is an arithmetic number, because the mean of its divisors is an integer number (31894875).

Almost surely, 2^245005021 is an apocalyptic number.

It is an amenable number.

245005021 is a deficient number, since it is larger than the sum of its proper divisors (10153979).

245005021 is a wasteful number, since it uses less digits than its factorization.

245005021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56879.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 245005021 is about 15652.6362316384. The cubic root of 245005021 is about 625.7367491000.

Adding to 245005021 its reverse (120500542), we get a palindrome (365505563).

The spelling of 245005021 in words is "two hundred forty-five million, five thousand, twenty-one".