400442021004 has 12 divisors (see below), whose sum is σ = 934364715704. Its totient is φ = 133480673664.

The previous prime is 400442020963. The next prime is 400442021027. The reversal of 400442021004 is 400120244004.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16685084197 + ... + 16685084220.

Almost surely, 2^400442021004 is an apocalyptic number.

It is an amenable number.

400442021004 is an abundant number, since it is smaller than the sum of its proper divisors (533922694700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400442021004 is a wasteful number, since it uses less digits than its factorization.

400442021004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33370168424 (or 33370168422 counting only the distinct ones).

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

Adding to 400442021004 its reverse (400120244004), we get a palindrome (800562265008).

The spelling of 400442021004 in words is "four hundred billion, four hundred forty-two million, twenty-one thousand, four".