40244244221 has 2 divisors, whose sum is σ = 40244244222. Its totient is φ = 40244244220.

The previous prime is 40244244137. The next prime is 40244244233. The reversal of 40244244221 is 12244244204.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36681825625 + 3562418596 = 191525^2 + 59686^2 .

It is a cyclic number.

It is not a de Polignac number, because 40244244221 - 2²⁶ = 40177135357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40244244121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20122122110 + 20122122111.

It is an arithmetic number, because the mean of its divisors is an integer number (20122122111).

Almost surely, 2^40244244221 is an apocalyptic number.

It is an amenable number.

40244244221 is a deficient number, since it is larger than the sum of its proper divisors (1).

40244244221 is an equidigital number, since it uses as much as digits as its factorization.

40244244221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16384, while the sum is 29.

Adding to 40244244221 its reverse (12244244204), we get a palindrome (52488488425).

The spelling of 40244244221 in words is "forty billion, two hundred forty-four million, two hundred forty-four thousand, two hundred twenty-one".