212100345 has 24 divisors (see below), whose sum is σ = 380320200. Its totient is φ = 109218816.

The previous prime is 212100341. The next prime is 212100349. The reversal of 212100345 is 543001212.

212100345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (212100341) and next prime (212100349).

It can be written as a sum of positive squares in 4 ways, for example, as 25040016 + 187060329 = 5004^2 + 13677^2 .

It is not a de Polignac number, because 212100345 - 2² = 212100341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212100341) 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, 79960 + ... + 82569.

It is an arithmetic number, because the mean of its divisors is an integer number (15846675).

Almost surely, 2^212100345 is an apocalyptic number.

It is an amenable number.

212100345 is a deficient number, since it is larger than the sum of its proper divisors (168219855).

212100345 is a wasteful number, since it uses less digits than its factorization.

212100345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162569 (or 162566 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 212100345 is about 14563.6652323514. The cubic root of 212100345 is about 596.3672580325.

Adding to 212100345 its reverse (543001212), we get a palindrome (755101557).

The spelling of 212100345 in words is "two hundred twelve million, one hundred thousand, three hundred forty-five".