26081721 has 12 divisors (see below), whose sum is σ = 37737648. Its totient is φ = 17358264.

The previous prime is 26081719. The next prime is 26081749. The reversal of 26081721 is 12718062.

It is not a de Polignac number, because 26081721 - 2¹ = 26081719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (26081761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4026 + ... + 8268.

It is an arithmetic number, because the mean of its divisors is an integer number (3144804).

Almost surely, 2^26081721 is an apocalyptic number.

It is an amenable number.

26081721 is a deficient number, since it is larger than the sum of its proper divisors (11655927).

26081721 is a wasteful number, since it uses less digits than its factorization.

26081721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4932 (or 4929 counting only the distinct ones).

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

The square root of 26081721 is about 5107.0266300461. The cubic root of 26081721 is about 296.5596644506.

Adding to 26081721 its reverse (12718062), we get a palindrome (38799783).

The spelling of 26081721 in words is "twenty-six million, eighty-one thousand, seven hundred twenty-one".