121520520425 has 6 divisors (see below), whose sum is σ = 150685445358. Its totient is φ = 97216416320.

The previous prime is 121520520377. The next prime is 121520520439. The reversal of 121520520425 is 524025025121.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 26580737296 + 94939783129 = 163036^2 + 308123^2 .

It is not a de Polignac number, because 121520520425 - 2⁶ = 121520520361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2430410384 + ... + 2430410433.

It is an arithmetic number, because the mean of its divisors is an integer number (25114240893).

Almost surely, 2^121520520425 is an apocalyptic number.

It is an amenable number.

121520520425 is a deficient number, since it is larger than the sum of its proper divisors (29164924933).

121520520425 is an equidigital number, since it uses as much as digits as its factorization.

121520520425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4860820827 (or 4860820822 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

Adding to 121520520425 its reverse (524025025121), we get a palindrome (645545545546).

The spelling of 121520520425 in words is "one hundred twenty-one billion, five hundred twenty million, five hundred twenty thousand, four hundred twenty-five".