121100915747 has 4 divisors (see below), whose sum is σ = 138401046576. Its totient is φ = 103800784920.

The previous prime is 121100915729. The next prime is 121100915827. The reversal of 121100915747 is 747519001121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 747519001121 = 3079 ⋅242779799.

It is a de Polignac number, because none of the positive numbers 2^k-121100915747 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121100915747.

It is not an unprimeable number, because it can be changed into a prime (121100915717) 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, 8650065404 + ... + 8650065417.

It is an arithmetic number, because the mean of its divisors is an integer number (34600261644).

Almost surely, 2^121100915747 is an apocalyptic number.

121100915747 is a deficient number, since it is larger than the sum of its proper divisors (17300130829).

121100915747 is an equidigital number, since it uses as much as digits as its factorization.

121100915747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17300130828.

The product of its (nonzero) digits is 17640, while the sum is 38.

Adding to 121100915747 its reverse (747519001121), we get a palindrome (868619916868).

The spelling of 121100915747 in words is "one hundred twenty-one billion, one hundred million, nine hundred fifteen thousand, seven hundred forty-seven".