400224351423221 has 16 divisors (see below), whose sum is σ = 445923833253360. Its totient is φ = 356658185802240.

The previous prime is 400224351423209. The next prime is 400224351423289. The reversal of 400224351423221 is 122324153422004.

It can be written as a sum of positive squares in 8 ways, for example, as 14796716222500 + 385427635200721 = 3846650^2 + 19632311^2 .

It is a cyclic number.

It is not a de Polignac number, because 400224351423221 - 2²⁶ = 400224284314357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400224351423521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56849240 + ... + 63500273.

It is an arithmetic number, because the mean of its divisors is an integer number (27870239578335).

Almost surely, 2^{400224351423221} is an apocalyptic number.

It is an amenable number.

400224351423221 is a deficient number, since it is larger than the sum of its proper divisors (45699481830139).

400224351423221 is a wasteful number, since it uses less digits than its factorization.

400224351423221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120358376.

The product of its (nonzero) digits is 92160, while the sum is 35.

The spelling of 400224351423221 in words is "four hundred trillion, two hundred twenty-four billion, three hundred fifty-one million, four hundred twenty-three thousand, two hundred twenty-one".