121819289169 has 4 divisors (see below), whose sum is σ = 162425718896. Its totient is φ = 81212859444.

The previous prime is 121819289131. The next prime is 121819289171. The reversal of 121819289169 is 961982918121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 961982918121 = 3 ⋅320660972707.

It is not a de Polignac number, because 121819289169 - 2³¹ = 119671805521 is a prime.

It is a super-2 number, since 2×121819289169² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121819288169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20303214859 + ... + 20303214864.

It is an arithmetic number, because the mean of its divisors is an integer number (40606429724).

Almost surely, 2^121819289169 is an apocalyptic number.

It is an amenable number.

121819289169 is a deficient number, since it is larger than the sum of its proper divisors (40606429727).

121819289169 is an equidigital number, since it uses as much as digits as its factorization.

121819289169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40606429726.

The product of its digits is 1119744, while the sum is 57.

The spelling of 121819289169 in words is "one hundred twenty-one billion, eight hundred nineteen million, two hundred eighty-nine thousand, one hundred sixty-nine".