26122120121 has 4 divisors (see below), whose sum is σ = 26759245044. Its totient is φ = 25484995200.

The previous prime is 26122120099. The next prime is 26122120163. The reversal of 26122120121 is 12102122162.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2232090025 + 23890030096 = 47245^2 + 154564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26122120121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26122120093 and 26122120102.

It is not an unprimeable number, because it can be changed into a prime (26122120021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318562400 + ... + 318562481.

It is an arithmetic number, because the mean of its divisors is an integer number (6689811261).

Almost surely, 2^26122120121 is an apocalyptic number.

It is an amenable number.

26122120121 is a deficient number, since it is larger than the sum of its proper divisors (637124923).

26122120121 is an equidigital number, since it uses as much as digits as its factorization.

26122120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637124922.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 26122120121 its reverse (12102122162), we get a palindrome (38224242283).

The spelling of 26122120121 in words is "twenty-six billion, one hundred twenty-two million, one hundred twenty thousand, one hundred twenty-one".