12121011801671 has 4 divisors (see below), whose sum is σ = 12257202945600. Its totient is φ = 11984820657744.

The previous prime is 12121011801653. The next prime is 12121011801707. The reversal of 12121011801671 is 17610811012121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121011801671 is a prime.

It is a super-2 number, since 2×12121011801671² (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 (12121011801631) 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 3 ways as a sum of consecutive naturals, for example, 68095571831 + ... + 68095572008.

It is an arithmetic number, because the mean of its divisors is an integer number (3064300736400).

Almost surely, 2^{12121011801671} is an apocalyptic number.

12121011801671 is a deficient number, since it is larger than the sum of its proper divisors (136191143929).

12121011801671 is an equidigital number, since it uses as much as digits as its factorization.

12121011801671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136191143928.

The product of its (nonzero) digits is 1344, while the sum is 32.

Adding to 12121011801671 its reverse (17610811012121), we get a palindrome (29731822813792).

The spelling of 12121011801671 in words is "twelve trillion, one hundred twenty-one billion, eleven million, eight hundred one thousand, six hundred seventy-one".