212105250 has 192 divisors, whose sum is σ = 682456320. Its totient is φ = 47757600.

The previous prime is 212105249. The next prime is 212105251. The reversal of 212105250 is 52501212.

It is an interprime number because it is at equal distance from previous prime (212105249) and next prime (212105251).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212105251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3165717 + ... + 3165783.

It is an arithmetic number, because the mean of its divisors is an integer number (3554460).

Almost surely, 2^212105250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212105250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (341228160).

212105250 is an abundant number, since it is smaller than the sum of its proper divisors (470351070).

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

212105250 is an equidigital number, since it uses as much as digits as its factorization.

212105250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 212105250 is about 14563.8336299204. The cubic root of 212105250 is about 596.3718551629.

Adding to 212105250 its reverse (52501212), we get a palindrome (264606462).

The spelling of 212105250 in words is "two hundred twelve million, one hundred five thousand, two hundred fifty".