121751531113 has 4 divisors (see below), whose sum is σ = 127045075968. Its totient is φ = 116457986260.

The previous prime is 121751531101. The next prime is 121751531117. The reversal of 121751531113 is 311135157121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 311135157121 = 23 ⋅13527615527.

It is a cyclic number.

It is not a de Polignac number, because 121751531113 - 2²¹ = 121749433961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121751531117) 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, 2646772393 + ... + 2646772438.

It is an arithmetic number, because the mean of its divisors is an integer number (31761268992).

Almost surely, 2^121751531113 is an apocalyptic number.

It is an amenable number.

121751531113 is a deficient number, since it is larger than the sum of its proper divisors (5293544855).

121751531113 is an equidigital number, since it uses as much as digits as its factorization.

121751531113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5293544854.

The product of its digits is 3150, while the sum is 31.

Adding to 121751531113 its reverse (311135157121), we get a palindrome (432886688234).

It can be divided in two parts, 121751 and 531113, that added together give a square (652864 = 808²).

The spelling of 121751531113 in words is "one hundred twenty-one billion, seven hundred fifty-one million, five hundred thirty-one thousand, one hundred thirteen".