121551324313011 has 4 divisors (see below), whose sum is σ = 162068432417352. Its totient is φ = 81034216208672.

The previous prime is 121551324313007. The next prime is 121551324313051. The reversal of 121551324313011 is 110313423155121.

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 121551324313011 - 2² = 121551324313007 is a prime.

It is a super-5 number, since 5×121551324313011⁵ (a number of 72 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (121551324313051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20258554052166 + ... + 20258554052171.

It is an arithmetic number, because the mean of its divisors is an integer number (40517108104338).

Almost surely, 2^{121551324313011} is an apocalyptic number.

121551324313011 is a deficient number, since it is larger than the sum of its proper divisors (40517108104341).

121551324313011 is an equidigital number, since it uses as much as digits as its factorization.

121551324313011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40517108104340.

The product of its (nonzero) digits is 10800, while the sum is 33.

Adding to 121551324313011 its reverse (110313423155121), we get a palindrome (231864747468132).

The spelling of 121551324313011 in words is "one hundred twenty-one trillion, five hundred fifty-one billion, three hundred twenty-four million, three hundred thirteen thousand, eleven".