213231211220 has 48 divisors (see below), whose sum is σ = 450870295680. Its totient is φ = 84705699456.

The previous prime is 213231211201. The next prime is 213231211241. The reversal of 213231211220 is 22112132312.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 213231211192 and 213231211201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4452161 + ... + 4499799.

It is an arithmetic number, because the mean of its divisors is an integer number (9393131160).

Almost surely, 2^213231211220 is an apocalyptic number.

213231211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213231211220 is an abundant number, since it is smaller than the sum of its proper divisors (237639084460).

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

213231211220 is a wasteful number, since it uses less digits than its factorization.

213231211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49184 (or 49182 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 213231211220 its reverse (22112132312), we get a palindrome (235343343532).

The spelling of 213231211220 in words is "two hundred thirteen billion, two hundred thirty-one million, two hundred eleven thousand, two hundred twenty".