26121321 has 6 divisors (see below), whose sum is σ = 37730810. Its totient is φ = 17414208.

The previous prime is 26121311. The next prime is 26121323. The reversal of 26121321 is 12312162.

It can be written as a sum of positive squares in only one way, i.e., 20575296 + 5546025 = 4536^2 + 2355^2 .

It is not a de Polignac number, because 26121321 - 2⁵ = 26121289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26121294 and 26121303.

It is not an unprimeable number, because it can be changed into a prime (26121323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1451176 + ... + 1451193.

Almost surely, 2^26121321 is an apocalyptic number.

It is an amenable number.

26121321 is a deficient number, since it is larger than the sum of its proper divisors (11609489).

26121321 is a wasteful number, since it uses less digits than its factorization.

26121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902375 (or 2902372 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 26121321 is about 5110.9021708501. The cubic root of 26121321 is about 296.7096778666.

Adding to 26121321 its reverse (12312162), we get a palindrome (38433483).

The spelling of 26121321 in words is "twenty-six million, one hundred twenty-one thousand, three hundred twenty-one".