213221203404 has 72 divisors (see below), whose sum is σ = 551789469504. Its totient is φ = 63553118400.

The previous prime is 213221203357. The next prime is 213221203417. The reversal of 213221203404 is 404302122312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 274119 + ... + 708225.

It is an arithmetic number, because the mean of its divisors is an integer number (7663742632).

Almost surely, 2^213221203404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213221203404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275894734752).

213221203404 is an abundant number, since it is smaller than the sum of its proper divisors (338568266100).

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

213221203404 is a wasteful number, since it uses less digits than its factorization.

213221203404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434247 (or 434184 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 213221203404 its reverse (404302122312), we get a palindrome (617523325716).

The spelling of 213221203404 in words is "two hundred thirteen billion, two hundred twenty-one million, two hundred three thousand, four hundred four".