26780121 has 6 divisors (see below), whose sum is σ = 38682410. Its totient is φ = 17853408.

The previous prime is 26780113. The next prime is 26780129. The reversal of 26780121 is 12108762.

It is an interprime number because it is at equal distance from previous prime (26780113) and next prime (26780129).

It can be written as a sum of positive squares in only one way, i.e., 25613721 + 1166400 = 5061^2 + 1080^2 .

It is not a de Polignac number, because 26780121 - 2³ = 26780113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26780129) 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, 1487776 + ... + 1487793.

Almost surely, 2^26780121 is an apocalyptic number.

It is an amenable number.

26780121 is a deficient number, since it is larger than the sum of its proper divisors (11902289).

26780121 is a wasteful number, since it uses less digits than its factorization.

26780121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2975575 (or 2975572 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 26780121 is about 5174.9513041187. The cubic root of 26780121 is about 299.1834126336.

Adding to 26780121 its reverse (12108762), we get a palindrome (38888883).

The spelling of 26780121 in words is "twenty-six million, seven hundred eighty thousand, one hundred twenty-one".