400101221 has 16 divisors (see below), whose sum is σ = 468195840. Its totient is φ = 338592960.

The previous prime is 400101217. The next prime is 400101223. The reversal of 400101221 is 122101004.

It is a cyclic number.

It is not a de Polignac number, because 400101221 - 2² = 400101217 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 (400101223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18470 + ... + 33783.

It is an arithmetic number, because the mean of its divisors is an integer number (29262240).

Almost surely, 2^400101221 is an apocalyptic number.

It is an amenable number.

400101221 is a deficient number, since it is larger than the sum of its proper divisors (68094619).

400101221 is a wasteful number, since it uses less digits than its factorization.

400101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52316.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 400101221 is about 20002.5303649313. The cubic root of 400101221 is about 736.8684447118.

Adding to 400101221 its reverse (122101004), we get a palindrome (522202225).

The spelling of 400101221 in words is "four hundred million, one hundred one thousand, two hundred twenty-one".