400010021033221 has 2 divisors, whose sum is σ = 400010021033222. Its totient is φ = 400010021033220.

The previous prime is 400010021033201. The next prime is 400010021033297. The reversal of 400010021033221 is 122330120010004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 248838446848996 + 151171574184225 = 15774614^2 + 12295185^2 .

It is a cyclic number.

It is not a de Polignac number, because 400010021033221 - 2⁹ = 400010021032709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400010021033201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200005010516610 + 200005010516611.

It is an arithmetic number, because the mean of its divisors is an integer number (200005010516611).

Almost surely, 2^{400010021033221} is an apocalyptic number.

It is an amenable number.

400010021033221 is a deficient number, since it is larger than the sum of its proper divisors (1).

400010021033221 is an equidigital number, since it uses as much as digits as its factorization.

400010021033221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 400010021033221 its reverse (122330120010004), we get a palindrome (522340141043225).

The spelling of 400010021033221 in words is "four hundred trillion, ten billion, twenty-one million, thirty-three thousand, two hundred twenty-one".