26221131 has 8 divisors (see below), whose sum is σ = 38846160. Its totient is φ = 17480736.

The previous prime is 26221109. The next prime is 26221141. The reversal of 26221131 is 13112262.

26221131 is a `hidden beast` number, since 2 + 622 + 11 + 31 = 666.

It is not a de Polignac number, because 26221131 - 2⁷ = 26221003 is a prime.

It is a super-2 number, since 2×26221131² = 1375095421838322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26221141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 485550 + ... + 485603.

It is an arithmetic number, because the mean of its divisors is an integer number (4855770).

Almost surely, 2^26221131 is an apocalyptic number.

26221131 is a deficient number, since it is larger than the sum of its proper divisors (12625029).

26221131 is an equidigital number, since it uses as much as digits as its factorization.

26221131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971162 (or 971156 counting only the distinct ones).

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

The square root of 26221131 is about 5120.6572820293. The cubic root of 26221131 is about 297.0871084150.

Adding to 26221131 its reverse (13112262), we get a palindrome (39333393).

The spelling of 26221131 in words is "twenty-six million, two hundred twenty-one thousand, one hundred thirty-one".