121672717755 has 32 divisors (see below), whose sum is σ = 197003548224. Its totient is φ = 64118562816.

The previous prime is 121672717709. The next prime is 121672717757. The reversal of 121672717755 is 557717276121.

It is a happy number.

It is not a de Polignac number, because 121672717755 - 2³² = 117377750459 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121672717698 and 121672717707.

It is not an unprimeable number, because it can be changed into a prime (121672717757) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 829969 + ... + 965501.

It is an arithmetic number, because the mean of its divisors is an integer number (6156360882).

Almost surely, 2^121672717755 is an apocalyptic number.

121672717755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121672717755 is a deficient number, since it is larger than the sum of its proper divisors (75330830469).

121672717755 is a wasteful number, since it uses less digits than its factorization.

121672717755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136255.

The product of its digits is 1440600, while the sum is 51.

The spelling of 121672717755 in words is "one hundred twenty-one billion, six hundred seventy-two million, seven hundred seventeen thousand, seven hundred fifty-five".