26242040221 has 6 divisors (see below), whose sum is σ = 26410276410. Its totient is φ = 26074868976.

The previous prime is 26242040189. The next prime is 26242040239. The reversal of 26242040221 is 12204024262.

It can be written as a sum of positive squares in 3 ways, for example, as 2576025 + 26239464196 = 1605^2 + 161986^2 .

It is not a de Polignac number, because 26242040221 - 2⁵ = 26242040189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26242440221) 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, 507666 + ... + 556963.

It is an arithmetic number, because the mean of its divisors is an integer number (4401712735).

Almost surely, 2^26242040221 is an apocalyptic number.

It is an amenable number.

26242040221 is a deficient number, since it is larger than the sum of its proper divisors (168236189).

26242040221 is an equidigital number, since it uses as much as digits as its factorization.

26242040221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064943 (or 1064786 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 26242040221 its reverse (12204024262), we get a palindrome (38446064483).

The spelling of 26242040221 in words is "twenty-six billion, two hundred forty-two million, forty thousand, two hundred twenty-one".