400033403221 has 4 divisors (see below), whose sum is σ = 400044162700. Its totient is φ = 400022643744.

The previous prime is 400033403213. The next prime is 400033403281. The reversal of 400033403221 is 122304330004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 119101602321 + 280931800900 = 345111^2 + 530030^2 .

It is a cyclic number.

It is not a de Polignac number, because 400033403221 - 2³ = 400033403213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400033403192 and 400033403201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400033403201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5323776 + ... + 5398393.

It is an arithmetic number, because the mean of its divisors is an integer number (100011040675).

Almost surely, 2^400033403221 is an apocalyptic number.

It is an amenable number.

400033403221 is a deficient number, since it is larger than the sum of its proper divisors (10759479).

400033403221 is a wasteful number, since it uses less digits than its factorization.

400033403221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10759478.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 400033403221 its reverse (122304330004), we get a palindrome (522337733225).

The spelling of 400033403221 in words is "four hundred billion, thirty-three million, four hundred three thousand, two hundred twenty-one".