26215121 has 4 divisors (see below), whose sum is σ = 26225472. Its totient is φ = 26204772.

The previous prime is 26215109. The next prime is 26215141. The reversal of 26215121 is 12151262.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12151262 = 2 ⋅6075631.

It is a cyclic number.

It is not a de Polignac number, because 26215121 - 2¹⁴ = 26198737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26215093 and 26215102.

It is not an unprimeable number, because it can be changed into a prime (26215141) 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, 1460 + ... + 7386.

It is an arithmetic number, because the mean of its divisors is an integer number (6556368).

Almost surely, 2^26215121 is an apocalyptic number.

It is an amenable number.

26215121 is a deficient number, since it is larger than the sum of its proper divisors (10351).

26215121 is an equidigital number, since it uses as much as digits as its factorization.

26215121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10350.

The product of its digits is 240, while the sum is 20.

The square root of 26215121 is about 5120.0704096721. The cubic root of 26215121 is about 297.0644087845.

Adding to 26215121 its reverse (12151262), we get a palindrome (38366383).

The spelling of 26215121 in words is "twenty-six million, two hundred fifteen thousand, one hundred twenty-one".