222021212 has 48 divisors (see below), whose sum is σ = 461970432. Its totient is φ = 91385280.

The previous prime is 222021211. The next prime is 222021221. The reversal of 222021212 is 212120222.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222021211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71933 + ... + 74955.

It is an arithmetic number, because the mean of its divisors is an integer number (9624384).

Almost surely, 2^222021212 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 222021212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230985216).

222021212 is an abundant number, since it is smaller than the sum of its proper divisors (239949220).

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

222021212 is a wasteful number, since it uses less digits than its factorization.

222021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138 (or 3136 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 222021212 is about 14900.3762368606. The cubic root of 222021212 is about 605.5241792769.

Adding to 222021212 its reverse (212120222), we get a palindrome (434141434).

It can be divided in two parts, 2220 and 21212, that added together give a palindrome (23432).

The spelling of 222021212 in words is "two hundred twenty-two million, twenty-one thousand, two hundred twelve".