400431223542021 has 64 divisors (see below), whose sum is σ = 668804284809216. Its totient is φ = 207820536422400.

The previous prime is 400431223542011. The next prime is 400431223542041. The reversal of 400431223542021 is 120245322134004.

It is a happy number.

It is not a de Polignac number, because 400431223542021 - 2⁵ = 400431223541989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400431223542011) 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 63 ways as a sum of consecutive naturals, for example, 47343285 + ... + 55156586.

It is an arithmetic number, because the mean of its divisors is an integer number (10450066950144).

Almost surely, 2^{400431223542021} is an apocalyptic number.

It is an amenable number.

400431223542021 is a deficient number, since it is larger than the sum of its proper divisors (268373061267195).

400431223542021 is a wasteful number, since it uses less digits than its factorization.

400431223542021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102500282.

The product of its (nonzero) digits is 46080, while the sum is 33.

Adding to 400431223542021 its reverse (120245322134004), we get a palindrome (520676545676025).

The spelling of 400431223542021 in words is "four hundred trillion, four hundred thirty-one billion, two hundred twenty-three million, five hundred forty-two thousand, twenty-one".