40240244221 has 2 divisors, whose sum is σ = 40240244222. Its totient is φ = 40240244220.

The previous prime is 40240244207. The next prime is 40240244323. The reversal of 40240244221 is 12244204204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31401612025 + 8838632196 = 177205^2 + 94014^2 .

It is a cyclic number.

It is not a de Polignac number, because 40240244221 - 2⁵ = 40240244189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40240242221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20120122110 + 20120122111.

It is an arithmetic number, because the mean of its divisors is an integer number (20120122111).

Almost surely, 2^40240244221 is an apocalyptic number.

It is an amenable number.

40240244221 is a deficient number, since it is larger than the sum of its proper divisors (1).

40240244221 is an equidigital number, since it uses as much as digits as its factorization.

40240244221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4096, while the sum is 25.

Adding to 40240244221 its reverse (12244204204), we get a palindrome (52484448425).

The spelling of 40240244221 in words is "forty billion, two hundred forty million, two hundred forty-four thousand, two hundred twenty-one".