400243400442221 has 16 divisors (see below), whose sum is σ = 457845085248000. Its totient is φ = 342747787713408.

The previous prime is 400243400442167. The next prime is 400243400442323. The reversal of 400243400442221 is 122244004342004.

It is not a de Polignac number, because 400243400442221 - 2¹⁴ = 400243400425837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400243400042221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80535980 + ... + 85361178.

It is an arithmetic number, because the mean of its divisors is an integer number (28615317828000).

Almost surely, 2^{400243400442221} is an apocalyptic number.

It is an amenable number.

400243400442221 is a deficient number, since it is larger than the sum of its proper divisors (57601684805779).

400243400442221 is a wasteful number, since it uses less digits than its factorization.

400243400442221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4836188.

The product of its (nonzero) digits is 49152, while the sum is 32.

Adding to 400243400442221 its reverse (122244004342004), we get a palindrome (522487404784225).

The spelling of 400243400442221 in words is "four hundred trillion, two hundred forty-three billion, four hundred million, four hundred forty-two thousand, two hundred twenty-one".