121131533511 has 48 divisors (see below), whose sum is σ = 191792240640. Its totient is φ = 76185982080.

The previous prime is 121131533489. The next prime is 121131533519. The reversal of 121131533511 is 115335131121.

121131533511 is a `hidden beast` number, since 1 + 2 + 1 + 1 + 315 + 335 + 11 = 666.

It is not a de Polignac number, because 121131533511 - 2¹⁷ = 121131402439 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121131533519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1058266 + ... + 1167128.

It is an arithmetic number, because the mean of its divisors is an integer number (3995671680).

Almost surely, 2^121131533511 is an apocalyptic number.

121131533511 is a deficient number, since it is larger than the sum of its proper divisors (70660707129).

121131533511 is a wasteful number, since it uses less digits than its factorization.

121131533511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109138 (or 109126 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

Adding to 121131533511 its reverse (115335131121), we get a palindrome (236466664632).

The spelling of 121131533511 in words is "one hundred twenty-one billion, one hundred thirty-one million, five hundred thirty-three thousand, five hundred eleven".