400020220221 has 8 divisors (see below), whose sum is σ = 534871230720. Its totient is φ = 265924678272.

The previous prime is 400020220207. The next prime is 400020220231. The reversal of 400020220221 is 122022020004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400020220221 - 2¹³ = 400020212029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400020220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400020220231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188865901 + ... + 188868018.

It is an arithmetic number, because the mean of its divisors is an integer number (66858903840).

Almost surely, 2^400020220221 is an apocalyptic number.

It is an amenable number.

400020220221 is a deficient number, since it is larger than the sum of its proper divisors (134851010499).

400020220221 is a wasteful number, since it uses less digits than its factorization.

400020220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377734275.

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 400020220221 its reverse (122022020004), we get a palindrome (522042240225).

The spelling of 400020220221 in words is "four hundred billion, twenty million, two hundred twenty thousand, two hundred twenty-one".