400404224081 has 2 divisors, whose sum is σ = 400404224082. Its totient is φ = 400404224080.

The previous prime is 400404223993. The next prime is 400404224113. The reversal of 400404224081 is 180422404004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255388729600 + 145015494481 = 505360^2 + 380809^2 .

It is a cyclic number.

It is not a de Polignac number, because 400404224081 - 2¹⁰ = 400404223057 is a prime.

It is a super-2 number, since 2×400404224081² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400404224881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200202112040 + 200202112041.

It is an arithmetic number, because the mean of its divisors is an integer number (200202112041).

Almost surely, 2^400404224081 is an apocalyptic number.

It is an amenable number.

400404224081 is a deficient number, since it is larger than the sum of its proper divisors (1).

400404224081 is an equidigital number, since it uses as much as digits as its factorization.

400404224081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8192, while the sum is 29.

Adding to 400404224081 its reverse (180422404004), we get a palindrome (580826628085).

The spelling of 400404224081 in words is "four hundred billion, four hundred four million, two hundred twenty-four thousand, eighty-one".