213021320 has 16 divisors (see below), whose sum is σ = 479298060. Its totient is φ = 85208512.

The previous prime is 213021317. The next prime is 213021337. The reversal of 213021320 is 23120312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 211586116 + 1435204 = 14546^2 + 1198^2 .

It is a super-3 number, since 3×213021320³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213021295 and 213021304.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2662727 + ... + 2662806.

Almost surely, 2^213021320 is an apocalyptic number.

213021320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213021320 is an abundant number, since it is smaller than the sum of its proper divisors (266276740).

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

213021320 is a wasteful number, since it uses less digits than its factorization.

213021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5325544 (or 5325540 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 213021320 is about 14595.2499122146. The cubic root of 213021320 is about 597.2291869853.

Adding to 213021320 its reverse (23120312), we get a palindrome (236141632).

It can be divided in two parts, 21302 and 1320, that added together give a palindrome (22622).

The spelling of 213021320 in words is "two hundred thirteen million, twenty-one thousand, three hundred twenty".