121525140405 has 32 divisors (see below), whose sum is σ = 196272299520. Its totient is φ = 64203010560.

The previous prime is 121525140383. The next prime is 121525140409. The reversal of 121525140405 is 504041525121.

It is not a de Polignac number, because 121525140405 - 2³³ = 112935205813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121525140409) 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 31 ways as a sum of consecutive naturals, for example, 10001764 + ... + 10013906.

It is an arithmetic number, because the mean of its divisors is an integer number (6133509360).

Almost surely, 2^121525140405 is an apocalyptic number.

121525140405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121525140405 is a deficient number, since it is larger than the sum of its proper divisors (74747159115).

121525140405 is a wasteful number, since it uses less digits than its factorization.

121525140405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18381.

The product of its (nonzero) digits is 8000, while the sum is 30.

Adding to 121525140405 its reverse (504041525121), we get a palindrome (625566665526).

The spelling of 121525140405 in words is "one hundred twenty-one billion, five hundred twenty-five million, one hundred forty thousand, four hundred five".