26221257 has 12 divisors (see below), whose sum is σ = 39097344. Its totient is φ = 16916760.

The previous prime is 26221241. The next prime is 26221297. The reversal of 26221257 is 75212262.

It is not a de Polignac number, because 26221257 - 2⁴ = 26221241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26221257.

It is not an unprimeable number, because it can be changed into a prime (26221297) 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, 46713 + ... + 47270.

It is an arithmetic number, because the mean of its divisors is an integer number (3258112).

Almost surely, 2^26221257 is an apocalyptic number.

It is an amenable number.

26221257 is a deficient number, since it is larger than the sum of its proper divisors (12876087).

26221257 is a wasteful number, since it uses less digits than its factorization.

26221257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94020 (or 94017 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 26221257 is about 5120.6695851226. The cubic root of 26221257 is about 297.0875842770.

The spelling of 26221257 in words is "twenty-six million, two hundred twenty-one thousand, two hundred fifty-seven".