121353531525 has 36 divisors (see below), whose sum is σ = 228797543520. Its totient is φ = 61315466400.

The previous prime is 121353531443. The next prime is 121353531557. The reversal of 121353531525 is 525135353121.

121353531525 is a `hidden beast` number, since 1 + 21 + 3 + 53 + 531 + 52 + 5 = 666.

It is not a de Polignac number, because 121353531525 - 2¹⁸ = 121353269381 is a prime.

It is a super-2 number, since 2×121353531525² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121353531525.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 14189121 + ... + 14197670.

It is an arithmetic number, because the mean of its divisors is an integer number (6355487320).

Almost surely, 2^121353531525 is an apocalyptic number.

121353531525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121353531525 is a deficient number, since it is larger than the sum of its proper divisors (107444011995).

121353531525 is a wasteful number, since it uses less digits than its factorization.

121353531525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28386826 (or 28386818 counting only the distinct ones).

The product of its digits is 67500, while the sum is 36.

Adding to 121353531525 its reverse (525135353121), we get a palindrome (646488884646).

The spelling of 121353531525 in words is "one hundred twenty-one billion, three hundred fifty-three million, five hundred thirty-one thousand, five hundred twenty-five".