213212220 has 48 divisors (see below), whose sum is σ = 642919200. Its totient is φ = 52482816.

The previous prime is 213212179. The next prime is 213212261. The reversal of 213212220 is 22212312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (213212179) and next prime (213212261).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 213212220.

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, 135895 + ... + 137454.

It is an arithmetic number, because the mean of its divisors is an integer number (13394150).

Almost surely, 2^213212220 is an apocalyptic number.

213212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213212220 is an abundant number, since it is smaller than the sum of its proper divisors (429706980).

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

213212220 is a wasteful number, since it uses less digits than its factorization.

213212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273374 (or 273372 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 213212220 is about 14601.7882466498. The cubic root of 213212220 is about 597.4075369138.

Adding to 213212220 its reverse (22212312), we get a palindrome (235424532).

The spelling of 213212220 in words is "two hundred thirteen million, two hundred twelve thousand, two hundred twenty".