212222124 has 72 divisors (see below), whose sum is σ = 551416320. Its totient is φ = 68796000.

The previous prime is 212222113. The next prime is 212222149. The reversal of 212222124 is 421222212.

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is a junction number, because it is equal to n+sod(n) for n = 212222097 and 212222106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 201399 + ... + 202449.

It is an arithmetic number, because the mean of its divisors is an integer number (7658560).

Almost surely, 2^212222124 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212222124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275708160).

212222124 is an abundant number, since it is smaller than the sum of its proper divisors (339194196).

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

212222124 is a wasteful number, since it uses less digits than its factorization.

212222124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211 (or 1206 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 212222124 is about 14567.8455510758. The cubic root of 212222124 is about 596.4813724364.

Adding to 212222124 its reverse (421222212), we get a palindrome (633444336).

It can be divided in two parts, 21222212 and 4, that multiplied together give a palindrome (84888848).

The spelling of 212222124 in words is "two hundred twelve million, two hundred twenty-two thousand, one hundred twenty-four".