212323220 has 12 divisors (see below), whose sum is σ = 445878804. Its totient is φ = 84929280.

The previous prime is 212323219. The next prime is 212323229. The reversal of 212323220 is 22323212.

It can be written as a sum of positive squares in 2 ways, for example, as 104121616 + 108201604 = 10204^2 + 10402^2 .

It is a super-2 number, since 2×212323220² = 90162299502336800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212323229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5308061 + ... + 5308100.

It is an arithmetic number, because the mean of its divisors is an integer number (37156567).

Almost surely, 2^212323220 is an apocalyptic number.

212323220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212323220 is an abundant number, since it is smaller than the sum of its proper divisors (233555584).

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

212323220 is a wasteful number, since it uses less digits than its factorization.

212323220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10616170 (or 10616168 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 212323220 is about 14571.3149715460. The cubic root of 212323220 is about 596.5760724405.

Adding to 212323220 its reverse (22323212), we get a palindrome (234646432).

The spelling of 212323220 in words is "two hundred twelve million, three hundred twenty-three thousand, two hundred twenty".