400411023321121 has 2 divisors, whose sum is σ = 400411023321122. Its totient is φ = 400411023321120.

The previous prime is 400411023321053. The next prime is 400411023321167. The reversal of 400411023321121 is 121123320114004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248997038529600 + 151413984791521 = 15779640^2 + 12305039^2 .

It is a cyclic number.

It is not a de Polignac number, because 400411023321121 - 2¹⁹ = 400411022796833 is a prime.

It is not a weakly prime, because it can be changed into another prime (400411023421121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200205511660560 + 200205511660561.

It is an arithmetic number, because the mean of its divisors is an integer number (200205511660561).

Almost surely, 2^{400411023321121} is an apocalyptic number.

It is an amenable number.

400411023321121 is a deficient number, since it is larger than the sum of its proper divisors (1).

400411023321121 is an equidigital number, since it uses as much as digits as its factorization.

400411023321121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 400411023321121 its reverse (121123320114004), we get a palindrome (521534343435125).

The spelling of 400411023321121 in words is "four hundred trillion, four hundred eleven billion, twenty-three million, three hundred twenty-one thousand, one hundred twenty-one".