121740652051 has 4 divisors (see below), whose sum is σ = 125938605600. Its totient is φ = 117542698504.

The previous prime is 121740652009. The next prime is 121740652063. The reversal of 121740652051 is 150256047121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 150256047121 = 53 ⋅2835019757.

It is a cyclic number.

It is not a de Polignac number, because 121740652051 - 2¹³ = 121740643859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121740651998 and 121740652016.

It is not an unprimeable number, because it can be changed into a prime (121740602051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2098976731 + ... + 2098976788.

It is an arithmetic number, because the mean of its divisors is an integer number (31484651400).

Almost surely, 2^121740652051 is an apocalyptic number.

121740652051 is a deficient number, since it is larger than the sum of its proper divisors (4197953549).

121740652051 is an equidigital number, since it uses as much as digits as its factorization.

121740652051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4197953548.

The product of its (nonzero) digits is 16800, while the sum is 34.

Adding to 121740652051 its reverse (150256047121), we get a palindrome (271996699172).

The spelling of 121740652051 in words is "one hundred twenty-one billion, seven hundred forty million, six hundred fifty-two thousand, fifty-one".