245305121021 has 16 divisors (see below), whose sum is σ = 249874870464. Its totient is φ = 240763252224.

The previous prime is 245305121011. The next prime is 245305121099. The reversal of 245305121021 is 120121503542.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245305121021 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 (245305121011) 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, 35307470 + ... + 35314416.

It is an arithmetic number, because the mean of its divisors is an integer number (15617179404).

Almost surely, 2^245305121021 is an apocalyptic number.

It is an amenable number.

245305121021 is a deficient number, since it is larger than the sum of its proper divisors (4569749443).

245305121021 is a wasteful number, since it uses less digits than its factorization.

245305121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8860.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 245305121021 its reverse (120121503542), we get a palindrome (365426624563).

The spelling of 245305121021 in words is "two hundred forty-five billion, three hundred five million, one hundred twenty-one thousand, twenty-one".