121505655523145 has 8 divisors (see below), whose sum is σ = 145817922946056. Its totient is φ = 97197100206336.

The previous prime is 121505655523139. The next prime is 121505655523151. The reversal of 121505655523145 is 541325556505121.

It is an interprime number because it is at equal distance from previous prime (121505655523139) and next prime (121505655523151).

It can be written as a sum of positive squares in 4 ways, for example, as 76870388915776 + 44635266607369 = 8767576^2 + 6680963^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 121505655523145 - 2¹⁴ = 121505655506761 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121505655523093 and 121505655523102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 927954512 + ... + 928085441.

It is an arithmetic number, because the mean of its divisors is an integer number (18227240368257).

Almost surely, 2^{121505655523145} is an apocalyptic number.

It is an amenable number.

121505655523145 is a deficient number, since it is larger than the sum of its proper divisors (24312267422911).

121505655523145 is a wasteful number, since it uses less digits than its factorization.

121505655523145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856053051.

The product of its (nonzero) digits is 4500000, while the sum is 50.

The spelling of 121505655523145 in words is "one hundred twenty-one trillion, five hundred five billion, six hundred fifty-five million, five hundred twenty-three thousand, one hundred forty-five".