121718077108 has 24 divisors (see below), whose sum is σ = 223276394880. Its totient is φ = 57993862080.

The previous prime is 121718077051. The next prime is 121718077109. The reversal of 121718077108 is 801770817121.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121718077109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8622988 + ... + 8637091.

It is an arithmetic number, because the mean of its divisors is an integer number (9303183120).

Almost surely, 2^121718077108 is an apocalyptic number.

It is an amenable number.

121718077108 is a deficient number, since it is larger than the sum of its proper divisors (101558317772).

121718077108 is a wasteful number, since it uses less digits than its factorization.

121718077108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17260167 (or 17260165 counting only the distinct ones).

The product of its (nonzero) digits is 43904, while the sum is 43.

The spelling of 121718077108 in words is "one hundred twenty-one billion, seven hundred eighteen million, seventy-seven thousand, one hundred eight".