223121211222 has 128 divisors (see below), whose sum is σ = 574710764544. Its totient is φ = 56174197248.

The previous prime is 223121211197. The next prime is 223121211223. The reversal of 223121211222 is 222112121322.

It is a super-3 number, since 3×223121211222³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223121211223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 966513 + ... + 1174899.

It is an arithmetic number, because the mean of its divisors is an integer number (4489927848).

Almost surely, 2^223121211222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 223121211222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287355382272).

223121211222 is an abundant number, since it is smaller than the sum of its proper divisors (351589553322).

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

223121211222 is a wasteful number, since it uses less digits than its factorization.

223121211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208502.

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

Adding to 223121211222 its reverse (222112121322), we get a palindrome (445233332544).

The spelling of 223121211222 in words is "two hundred twenty-three billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twenty-two".