121761537123 has 4 divisors (see below), whose sum is σ = 162348716168. Its totient is φ = 81174358080.

The previous prime is 121761537083. The next prime is 121761537133. The reversal of 121761537123 is 321735167121.

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

It is not a de Polignac number, because 121761537123 - 2¹² = 121761533027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121761537133) 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, 20293589518 + ... + 20293589523.

It is an arithmetic number, because the mean of its divisors is an integer number (40587179042).

Almost surely, 2^121761537123 is an apocalyptic number.

121761537123 is a deficient number, since it is larger than the sum of its proper divisors (40587179045).

121761537123 is an equidigital number, since it uses as much as digits as its factorization.

121761537123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40587179044.

The product of its digits is 52920, while the sum is 39.

The spelling of 121761537123 in words is "one hundred twenty-one billion, seven hundred sixty-one million, five hundred thirty-seven thousand, one hundred twenty-three".