400223021 has 8 divisors (see below), whose sum is σ = 436826304. Its totient is φ = 363656320.

The previous prime is 400223009. The next prime is 400223041. The reversal of 400223021 is 120322004.

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 400223021 - 2⁶ = 400222957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400222987 and 400223005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400223041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17000 + ... + 33006.

It is an arithmetic number, because the mean of its divisors is an integer number (54603288).

Almost surely, 2^400223021 is an apocalyptic number.

It is an amenable number.

400223021 is a deficient number, since it is larger than the sum of its proper divisors (36603283).

400223021 is a wasteful number, since it uses less digits than its factorization.

400223021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18291.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 400223021 is about 20005.5747480546. The cubic root of 400223021 is about 736.9432103511.

Adding to 400223021 its reverse (120322004), we get a palindrome (520545025).

The spelling of 400223021 in words is "four hundred million, two hundred twenty-three thousand, twenty-one".