213320203440 has 40 divisors (see below), whose sum is σ = 661292631408. Its totient is φ = 56885387520.

The previous prime is 213320203423. The next prime is 213320203441. The reversal of 213320203440 is 44302023312.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 213320203440.

It is not an unprimeable number, because it can be changed into a prime (213320203441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 444416851 + ... + 444417330.

Almost surely, 2^213320203440 is an apocalyptic number.

213320203440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213320203440 is an abundant number, since it is smaller than the sum of its proper divisors (447972427968).

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

213320203440 is a wasteful number, since it uses less digits than its factorization.

213320203440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888834197 (or 888834191 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 213320203440 its reverse (44302023312), we get a palindrome (257622226752).

The spelling of 213320203440 in words is "two hundred thirteen billion, three hundred twenty million, two hundred three thousand, four hundred forty".