121565245425 has 48 divisors (see below), whose sum is σ = 219188471040. Its totient is φ = 59089904640.

The previous prime is 121565245411. The next prime is 121565245427. The reversal of 121565245425 is 524542565121.

It is not a de Polignac number, because 121565245425 - 2¹⁹ = 121564721137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121565245427) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 712104 + ... + 866153.

It is an arithmetic number, because the mean of its divisors is an integer number (4566426480).

Almost surely, 2^121565245425 is an apocalyptic number.

121565245425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121565245425 is a deficient number, since it is larger than the sum of its proper divisors (97623225615).

121565245425 is a wasteful number, since it uses less digits than its factorization.

121565245425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578362 (or 1578357 counting only the distinct ones).

The product of its digits is 480000, while the sum is 42.

The spelling of 121565245425 in words is "one hundred twenty-one billion, five hundred sixty-five million, two hundred forty-five thousand, four hundred twenty-five".