400244220401 has 2 divisors, whose sum is σ = 400244220402. Its totient is φ = 400244220400.

The previous prime is 400244220391. The next prime is 400244220403. The reversal of 400244220401 is 104022442004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 395565523600 + 4678696801 = 628940^2 + 68401^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400244220401 is a prime.

Together with 400244220403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400244220403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200122110200 + 200122110201.

It is an arithmetic number, because the mean of its divisors is an integer number (200122110201).

Almost surely, 2^400244220401 is an apocalyptic number.

It is an amenable number.

400244220401 is a deficient number, since it is larger than the sum of its proper divisors (1).

400244220401 is an equidigital number, since it uses as much as digits as its factorization.

400244220401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 400244220401 its reverse (104022442004), we get a palindrome (504266662405).

The spelling of 400244220401 in words is "four hundred billion, two hundred forty-four million, two hundred twenty thousand, four hundred one".