121534521311 has 8 divisors (see below), whose sum is σ = 138935132160. Its totient is φ = 104143544568.

The previous prime is 121534521271. The next prime is 121534521337. The reversal of 121534521311 is 113125435121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121534521311 - 2¹⁰ = 121534520287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121534521391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2381471 + ... + 2431968.

It is an arithmetic number, because the mean of its divisors is an integer number (17366891520).

Almost surely, 2^121534521311 is an apocalyptic number.

121534521311 is a deficient number, since it is larger than the sum of its proper divisors (17400610849).

121534521311 is an equidigital number, since it uses as much as digits as its factorization.

121534521311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4817053.

The product of its digits is 3600, while the sum is 29.

Adding to 121534521311 its reverse (113125435121), we get a palindrome (234659956432).

The spelling of 121534521311 in words is "one hundred twenty-one billion, five hundred thirty-four million, five hundred twenty-one thousand, three hundred eleven".