400332121220 has 48 divisors (see below), whose sum is σ = 865150104000. Its totient is φ = 155492555904.

The previous prime is 400332121193. The next prime is 400332121237. The reversal of 400332121220 is 22121233004.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 400332121192 and 400332121201.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 172814 + ... + 911333.

It is an arithmetic number, because the mean of its divisors is an integer number (18023960500).

Almost surely, 2^400332121220 is an apocalyptic number.

It is an amenable number.

400332121220 is an abundant number, since it is smaller than the sum of its proper divisors (464817982780).

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

400332121220 is a wasteful number, since it uses less digits than its factorization.

400332121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084692 (or 1084690 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 400332121220 its reverse (22121233004), we get a palindrome (422453354224).

The spelling of 400332121220 in words is "four hundred billion, three hundred thirty-two million, one hundred twenty-one thousand, two hundred twenty".