20121520079191 has 8 divisors (see below), whose sum is σ = 21239546198400. Its totient is φ = 19009393834680.

The previous prime is 20121520079183. The next prime is 20121520079203. The reversal of 20121520079191 is 19197002512102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20121520079191 - 2³ = 20121520079183 is a prime.

It is a super-2 number, since 2×20121520079191² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121520079891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1474961665 + ... + 1474975306.

It is an arithmetic number, because the mean of its divisors is an integer number (2654943274800).

Almost surely, 2^{20121520079191} is an apocalyptic number.

20121520079191 is a deficient number, since it is larger than the sum of its proper divisors (1118026119209).

20121520079191 is a wasteful number, since it uses less digits than its factorization.

20121520079191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2949937349.

The product of its (nonzero) digits is 22680, while the sum is 40.

The spelling of 20121520079191 in words is "twenty trillion, one hundred twenty-one billion, five hundred twenty million, seventy-nine thousand, one hundred ninety-one".