213231121320 has 64 divisors (see below), whose sum is σ = 731078133120. Its totient is φ = 48738541824.

The previous prime is 213231121319. The next prime is 213231121349. The reversal of 213231121320 is 23121132312.

It is a super-2 number, since 2×213231121320² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 126922447 + ... + 126924126.

It is an arithmetic number, because the mean of its divisors is an integer number (11423095830).

Almost surely, 2^213231121320 is an apocalyptic number.

213231121320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213231121320 is an abundant number, since it is smaller than the sum of its proper divisors (517847011800).

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

213231121320 is a wasteful number, since it uses less digits than its factorization.

213231121320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253846594 (or 253846590 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 213231121320 its reverse (23121132312), we get a palindrome (236352253632).

The spelling of 213231121320 in words is "two hundred thirteen billion, two hundred thirty-one million, one hundred twenty-one thousand, three hundred twenty".