213231310220 has 12 divisors (see below), whose sum is σ = 447785751504. Its totient is φ = 85292524080.

The previous prime is 213231310219. The next prime is 213231310289. The reversal of 213231310220 is 22013132312.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 10661565511 = 213231310220 / (2 + 1 + 3 + 2 + 3 + 1 + 3 + 1 + 0 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 213231310192 and 213231310201.

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, 5330782736 + ... + 5330782775.

It is an arithmetic number, because the mean of its divisors is an integer number (37315479292).

Almost surely, 2^213231310220 is an apocalyptic number.

213231310220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213231310220 is an abundant number, since it is smaller than the sum of its proper divisors (234554441284).

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

213231310220 is a wasteful number, since it uses less digits than its factorization.

213231310220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10661565520 (or 10661565518 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 213231310220 its reverse (22013132312), we get a palindrome (235244442532).

The spelling of 213231310220 in words is "two hundred thirteen billion, two hundred thirty-one million, three hundred ten thousand, two hundred twenty".