400121220211 has 2 divisors, whose sum is σ = 400121220212. Its totient is φ = 400121220210.

The previous prime is 400121220151. The next prime is 400121220217. The reversal of 400121220211 is 112022121004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400121220211 - 2¹⁵ = 400121187443 is a prime.

It is not a weakly prime, because it can be changed into another prime (400121220217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200060610105 + 200060610106.

It is an arithmetic number, because the mean of its divisors is an integer number (200060610106).

Almost surely, 2^400121220211 is an apocalyptic number.

400121220211 is a deficient number, since it is larger than the sum of its proper divisors (1).

400121220211 is an equidigital number, since it uses as much as digits as its factorization.

400121220211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 400121220211 its reverse (112022121004), we get a palindrome (512143341215).

The spelling of 400121220211 in words is "four hundred billion, one hundred twenty-one million, two hundred twenty thousand, two hundred eleven".