400021822000 has 40 divisors (see below), whose sum is σ = 967252770432. Its totient is φ = 160008728000.

The previous prime is 400021821949. The next prime is 400021822003. The reversal of 400021822000 is 228120004.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (400021822003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100003456 + ... + 100007455.

Almost surely, 2^400021822000 is an apocalyptic number.

400021822000 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400021822000 is an abundant number, since it is smaller than the sum of its proper divisors (567230948432).

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

400021822000 is a wasteful number, since it uses less digits than its factorization.

400021822000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200010934 (or 200010918 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 400021822000 its reverse (228120004), we get a palindrome (400249942004).

The spelling of 400021822000 in words is "four hundred billion, twenty-one million, eight hundred twenty-two thousand".