212121212223 has 32 divisors (see below), whose sum is σ = 305720593920. Its totient is φ = 130483612160.

The previous prime is 212121212209. The next prime is 212121212257. The reversal of 212121212223 is 322212121212.

It is a cyclic number.

It is not a de Polignac number, because 212121212223 - 2⁶ = 212121212159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212121212223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121212123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 169461 + ... + 673022.

It is an arithmetic number, because the mean of its divisors is an integer number (9553768560).

Almost surely, 2^212121212223 is an apocalyptic number.

212121212223 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

212121212223 is a deficient number, since it is larger than the sum of its proper divisors (93599381697).

212121212223 is a wasteful number, since it uses less digits than its factorization.

212121212223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842639.

The product of its digits is 384, while the sum is 21.

Adding to 212121212223 its reverse (322212121212), we get a palindrome (534333333435).

The spelling of 212121212223 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty-three".