400234221 has 12 divisors (see below), whose sum is σ = 608543520. Its totient is φ = 252779400.

The previous prime is 400234199. The next prime is 400234223. The reversal of 400234221 is 122432004.

It is not a de Polignac number, because 400234221 - 2¹⁸ = 399972077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400234194 and 400234203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400234223) 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 11 ways as a sum of consecutive naturals, for example, 1170105 + ... + 1170446.

It is an arithmetic number, because the mean of its divisors is an integer number (50711960).

Almost surely, 2^400234221 is an apocalyptic number.

It is an amenable number.

400234221 is a deficient number, since it is larger than the sum of its proper divisors (208309299).

400234221 is a wasteful number, since it uses less digits than its factorization.

400234221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340576 (or 2340573 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 400234221 is about 20005.8546680715. The cubic root of 400234221 is about 736.9500845908.

Adding to 400234221 its reverse (122432004), we get a palindrome (522666225).

It can be divided in two parts, 40023 and 4221, that added together give a palindrome (44244).

The spelling of 400234221 in words is "four hundred million, two hundred thirty-four thousand, two hundred twenty-one".