212225520 has 160 divisors (see below), whose sum is σ = 713954304. Its totient is φ = 51840000.

The previous prime is 212225513. The next prime is 212225551. The reversal of 212225520 is 25522212.

212225520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 782985 + ... + 783255.

Almost surely, 2^212225520 is an apocalyptic number.

212225520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212225520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (356977152).

212225520 is an abundant number, since it is smaller than the sum of its proper divisors (501728784).

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

212225520 is a wasteful number, since it uses less digits than its factorization.

212225520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 545 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 212225520 is about 14567.9621086822. The cubic root of 212225520 is about 596.4845540713.

Adding to 212225520 its reverse (25522212), we get a palindrome (237747732).

The spelling of 212225520 in words is "two hundred twelve million, two hundred twenty-five thousand, five hundred twenty".