245401522121 has 12 divisors (see below), whose sum is σ = 285633047700. Its totient is φ = 210221867520.

The previous prime is 245401522117. The next prime is 245401522129. The reversal of 245401522121 is 121225104542.

It can be written as a sum of positive squares in 2 ways, for example, as 188824142521 + 56577379600 = 434539^2 + 237860^2 .

It is not a de Polignac number, because 245401522121 - 2² = 245401522117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (245401522129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1370696 + ... + 1539353.

It is an arithmetic number, because the mean of its divisors is an integer number (23802753975).

Almost surely, 2^245401522121 is an apocalyptic number.

It is an amenable number.

245401522121 is a deficient number, since it is larger than the sum of its proper divisors (40231525579).

245401522121 is a wasteful number, since it uses less digits than its factorization.

245401522121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2911784 (or 2911777 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 245401522121 its reverse (121225104542), we get a palindrome (366626626663).

The spelling of 245401522121 in words is "two hundred forty-five billion, four hundred one million, five hundred twenty-two thousand, one hundred twenty-one".