213112220 has 24 divisors (see below), whose sum is σ = 448308000. Its totient is φ = 85097792.

The previous prime is 213112177. The next prime is 213112247. The reversal of 213112220 is 22211312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 213112195 and 213112204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3086 + ... + 20874.

It is an arithmetic number, because the mean of its divisors is an integer number (18679500).

Almost surely, 2^213112220 is an apocalyptic number.

213112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213112220 is an abundant number, since it is smaller than the sum of its proper divisors (235195780).

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

213112220 is a wasteful number, since it uses less digits than its factorization.

213112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18397 (or 18395 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 213112220 is about 14598.3636069253. The cubic root of 213112220 is about 597.3141243568.

Adding to 213112220 its reverse (22211312), we get a palindrome (235323532).

The spelling of 213112220 in words is "two hundred thirteen million, one hundred twelve thousand, two hundred twenty".