213331220 has 24 divisors (see below), whose sum is σ = 453033000. Its totient is φ = 84372992.

The previous prime is 213331219. The next prime is 213331229. The reversal of 213331220 is 22133312.

213331220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 988036 + 212343184 = 994^2 + 14572^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213331229) 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, 58145 + ... + 61704.

It is an arithmetic number, because the mean of its divisors is an integer number (18876375).

Almost surely, 2^213331220 is an apocalyptic number.

213331220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213331220 is an abundant number, since it is smaller than the sum of its proper divisors (239701780).

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

213331220 is a wasteful number, since it uses less digits than its factorization.

213331220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119947 (or 119945 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 213331220 is about 14605.8625216041. The cubic root of 213331220 is about 597.5186598049.

Adding to 213331220 its reverse (22133312), we get a palindrome (235464532).

The spelling of 213331220 in words is "two hundred thirteen million, three hundred thirty-one thousand, two hundred twenty".