26365612121 has 4 divisors (see below), whose sum is σ = 26368908852. Its totient is φ = 26362315392.

The previous prime is 26365612109. The next prime is 26365612129. The reversal of 26365612121 is 12121656362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12121656362 = 2 ⋅6060828181.

It can be written as a sum of positive squares in 2 ways, for example, as 11742756496 + 14622855625 = 108364^2 + 120925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26365612121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26365612129) 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, 1636340 + ... + 1652373.

It is an arithmetic number, because the mean of its divisors is an integer number (6592227213).

Almost surely, 2^26365612121 is an apocalyptic number.

It is an amenable number.

26365612121 is a deficient number, since it is larger than the sum of its proper divisors (3296731).

26365612121 is an equidigital number, since it uses as much as digits as its factorization.

26365612121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3296730.

The product of its digits is 25920, while the sum is 35.

The spelling of 26365612121 in words is "twenty-six billion, three hundred sixty-five million, six hundred twelve thousand, one hundred twenty-one".