212211552 has 144 divisors (see below), whose sum is σ = 654136560. Its totient is φ = 60060672.

The previous prime is 212211541. The next prime is 212211553. The reversal of 212211552 is 255112212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212211553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 926574 + ... + 926802.

It is an arithmetic number, because the mean of its divisors is an integer number (4542615).

Almost surely, 2^212211552 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 212211552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327068280).

212211552 is an abundant number, since it is smaller than the sum of its proper divisors (441925008).

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

212211552 is a wasteful number, since it uses less digits than its factorization.

212211552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453 (or 438 counting only the distinct ones).

The product of its digits is 400, while the sum is 21.

The square root of 212211552 is about 14567.4826926274. The cubic root of 212211552 is about 596.4714675536.

Adding to 212211552 its reverse (255112212), we get a palindrome (467323764).

The spelling of 212211552 in words is "two hundred twelve million, two hundred eleven thousand, five hundred fifty-two".