210012220 has 96 divisors (see below), whose sum is σ = 513729216. Its totient is φ = 71270400.

The previous prime is 210012193. The next prime is 210012223. The reversal of 210012220 is 22210012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 210012197 and 210012206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210012223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 871300 + ... + 871540.

It is an arithmetic number, because the mean of its divisors is an integer number (5351346).

Almost surely, 2^210012220 is an apocalyptic number.

210012220 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 210012220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256864608).

210012220 is an abundant number, since it is smaller than the sum of its proper divisors (303716996).

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

210012220 is a wasteful number, since it uses less digits than its factorization.

210012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511 (or 509 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 210012220 is about 14491.7983701127. The cubic root of 210012220 is about 594.4037243743.

Adding to 210012220 its reverse (22210012), we get a palindrome (232222232).

The spelling of 210012220 in words is "two hundred ten million, twelve thousand, two hundred twenty".