121540304311 has 4 divisors (see below), whose sum is σ = 126824665392. Its totient is φ = 116255943232.

The previous prime is 121540304309. The next prime is 121540304359. The reversal of 121540304311 is 113403045121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121540304311 - 2¹ = 121540304309 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 (121540302311) 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 3 ways as a sum of consecutive naturals, for example, 2642180506 + ... + 2642180551.

It is an arithmetic number, because the mean of its divisors is an integer number (31706166348).

Almost surely, 2^121540304311 is an apocalyptic number.

121540304311 is a deficient number, since it is larger than the sum of its proper divisors (5284361081).

121540304311 is an equidigital number, since it uses as much as digits as its factorization.

121540304311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5284361080.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 121540304311 its reverse (113403045121), we get a palindrome (234943349432).

The spelling of 121540304311 in words is "one hundred twenty-one billion, five hundred forty million, three hundred four thousand, three hundred eleven".