400133221 has 16 divisors (see below), whose sum is σ = 419526720. Its totient is φ = 381352320.

The previous prime is 400133219. The next prime is 400133249. The reversal of 400133221 is 122331004.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 400133221 - 2¹ = 400133219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400133195 and 400133204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400130221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261966 + ... + 263488.

It is an arithmetic number, because the mean of its divisors is an integer number (26220420).

Almost surely, 2^400133221 is an apocalyptic number.

It is an amenable number.

400133221 is a deficient number, since it is larger than the sum of its proper divisors (19393499).

400133221 is a wasteful number, since it uses less digits than its factorization.

400133221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 400133221 is about 20003.3302477363. The cubic root of 400133221 is about 736.8880890421. Note that the first 3 decimals are identical.

Adding to 400133221 its reverse (122331004), we get a palindrome (522464225).

It can be divided in two parts, 40013 and 3221, that added together give a palindrome (43234).

The spelling of 400133221 in words is "four hundred million, one hundred thirty-three thousand, two hundred twenty-one".