121101116778 has 48 divisors (see below), whose sum is σ = 271026153216. Its totient is φ = 39039442560.

The previous prime is 121101116729. The next prime is 121101116779. The reversal of 121101116778 is 877611101121.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121101116779) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 796701 + ... + 936447.

It is an arithmetic number, because the mean of its divisors is an integer number (5646378192).

Almost surely, 2^121101116778 is an apocalyptic number.

121101116778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121101116778 is an abundant number, since it is smaller than the sum of its proper divisors (149925036438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121101116778 is a wasteful number, since it uses less digits than its factorization.

121101116778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141339 (or 141336 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 36.

Adding to 121101116778 its reverse (877611101121), we get a palindrome (998712217899).

The spelling of 121101116778 in words is "one hundred twenty-one billion, one hundred one million, one hundred sixteen thousand, seven hundred seventy-eight".