400224167821 has 8 divisors (see below), whose sum is σ = 400549032000. Its totient is φ = 399899380320.

The previous prime is 400224167813. The next prime is 400224167851. The reversal of 400224167821 is 128761422004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400224167821 - 2³ = 400224167813 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 (400224167851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14943240 + ... + 14969998.

It is an arithmetic number, because the mean of its divisors is an integer number (50068629000).

Almost surely, 2^400224167821 is an apocalyptic number.

It is an amenable number.

400224167821 is a deficient number, since it is larger than the sum of its proper divisors (324864179).

400224167821 is a wasteful number, since it uses less digits than its factorization.

400224167821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38339.

The product of its (nonzero) digits is 43008, while the sum is 37.

Adding to 400224167821 its reverse (128761422004), we get a palindrome (528985589825).

The spelling of 400224167821 in words is "four hundred billion, two hundred twenty-four million, one hundred sixty-seven thousand, eight hundred twenty-one".