212100545 has 4 divisors (see below), whose sum is σ = 254520660. Its totient is φ = 169680432.

The previous prime is 212100533. The next prime is 212100547. The reversal of 212100545 is 545001212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 150822961 + 61277584 = 12281^2 + 7828^2 .

It is a cyclic number.

It is not a de Polignac number, because 212100545 - 2²² = 207906241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212100547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21210050 + ... + 21210059.

It is an arithmetic number, because the mean of its divisors is an integer number (63630165).

Almost surely, 2^212100545 is an apocalyptic number.

It is an amenable number.

212100545 is a deficient number, since it is larger than the sum of its proper divisors (42420115).

212100545 is an equidigital number, since it uses as much as digits as its factorization.

212100545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42420114.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 212100545 is about 14563.6720987531. The cubic root of 212100545 is about 596.3674454805.

Adding to 212100545 its reverse (545001212), we get a palindrome (757101757).

The spelling of 212100545 in words is "two hundred twelve million, one hundred thousand, five hundred forty-five".