121680634471279 has 16 divisors (see below), whose sum is σ = 137949477321600. Its totient is φ = 106399783568736.

The previous prime is 121680634471267. The next prime is 121680634471289. The reversal of 121680634471279 is 972174436086121.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121680634471279 is a prime.

It is a super-2 number, since 2×121680634471279² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121680634471229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18412729 + ... + 24132754.

It is an arithmetic number, because the mean of its divisors is an integer number (8621842332600).

Almost surely, 2^{121680634471279} is an apocalyptic number.

121680634471279 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

121680634471279 is a deficient number, since it is larger than the sum of its proper divisors (16268842850321).

121680634471279 is a wasteful number, since it uses less digits than its factorization.

121680634471279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42557094.

The product of its (nonzero) digits is 24385536, while the sum is 61.

The spelling of 121680634471279 in words is "one hundred twenty-one trillion, six hundred eighty billion, six hundred thirty-four million, four hundred seventy-one thousand, two hundred seventy-nine".