400211121112021 has 2 divisors, whose sum is σ = 400211121112022. Its totient is φ = 400211121112020.

The previous prime is 400211121111917. The next prime is 400211121112027. The reversal of 400211121112021 is 120211121112004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212349420861796 + 187861700250225 = 14572214^2 + 13706265^2 .

It is a cyclic number.

It is not a de Polignac number, because 400211121112021 - 2⁹ = 400211121111509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400211121112021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400211121112027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200105560556010 + 200105560556011.

It is an arithmetic number, because the mean of its divisors is an integer number (200105560556011).

Almost surely, 2^{400211121112021} is an apocalyptic number.

It is an amenable number.

400211121112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

400211121112021 is an equidigital number, since it uses as much as digits as its factorization.

400211121112021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 400211121112021 its reverse (120211121112004), we get a palindrome (520422242224025).

The spelling of 400211121112021 in words is "four hundred trillion, two hundred eleven billion, one hundred twenty-one million, one hundred twelve thousand, twenty-one".