213230231220 has 48 divisors (see below), whose sum is σ = 597256914240. Its totient is φ = 56841179136.

The previous prime is 213230231189. The next prime is 213230231297. The reversal of 213230231220 is 22132032312.

It is a happy number.

It is a super-2 number, since 2×213230231220² (a number of 23 digits) contains 22 as substring.

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, 461197 + ... + 799476.

It is an arithmetic number, because the mean of its divisors is an integer number (12442852380).

Almost surely, 2^213230231220 is an apocalyptic number.

213230231220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213230231220 is an abundant number, since it is smaller than the sum of its proper divisors (384026683020).

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

213230231220 is a wasteful number, since it uses less digits than its factorization.

213230231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263504 (or 1263502 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 213230231220 its reverse (22132032312), we get a palindrome (235362263532).

The spelling of 213230231220 in words is "two hundred thirteen billion, two hundred thirty million, two hundred thirty-one thousand, two hundred twenty".