212222172 has 48 divisors (see below), whose sum is σ = 529827200. Its totient is φ = 65914560.

The previous prime is 212222167. The next prime is 212222177. The reversal of 212222172 is 271222212.

It is an interprime number because it is at equal distance from previous prime (212222167) and next prime (212222177).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212222177) 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, 6279 + ... + 21537.

Almost surely, 2^212222172 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 212222172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264913600).

212222172 is an abundant number, since it is smaller than the sum of its proper divisors (317605028).

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

212222172 is a wasteful number, since it uses less digits than its factorization.

212222172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15346 (or 15344 counting only the distinct ones).

The product of its digits is 448, while the sum is 21.

The square root of 212222172 is about 14567.8471985397. The cubic root of 212222172 is about 596.4814174068.

Adding to 212222172 its reverse (271222212), we get a palindrome (483444384).

The spelling of 212222172 in words is "two hundred twelve million, two hundred twenty-two thousand, one hundred seventy-two".