400442004021 has 16 divisors (see below), whose sum is σ = 538062041088. Its totient is φ = 264892134000.

The previous prime is 400442003989. The next prime is 400442004029. The reversal of 400442004021 is 120400244004.

It is not a de Polignac number, because 400442004021 - 2⁵ = 400442003989 is a prime.

It is a super-3 number, since 3×400442004021³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400442004029) 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, 3540670 + ... + 3652016.

It is an arithmetic number, because the mean of its divisors is an integer number (33628877568).

Almost surely, 2^400442004021 is an apocalyptic number.

It is an amenable number.

400442004021 is a deficient number, since it is larger than the sum of its proper divisors (137620037067).

400442004021 is a wasteful number, since it uses less digits than its factorization.

400442004021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120632.

The product of its (nonzero) digits is 1024, while the sum is 21.

Adding to 400442004021 its reverse (120400244004), we get a palindrome (520842248025).

The spelling of 400442004021 in words is "four hundred billion, four hundred forty-two million, four thousand, twenty-one".