212105545 has 8 divisors (see below), whose sum is σ = 255052224. Its totient is φ = 169334064.

The previous prime is 212105539. The next prime is 212105557. The reversal of 212105545 is 545501212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212105545 - 2¹⁷ = 211974473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41119 + ... + 45988.

It is an arithmetic number, because the mean of its divisors is an integer number (31881528).

Almost surely, 2^212105545 is an apocalyptic number.

It is an amenable number.

212105545 is a deficient number, since it is larger than the sum of its proper divisors (42946679).

212105545 is an equidigital number, since it uses as much as digits as its factorization.

212105545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87599.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 212105545 is about 14563.8437577447. The cubic root of 212105545 is about 596.3721316445.

Adding to 212105545 its reverse (545501212), we get a palindrome (757606757).

The spelling of 212105545 in words is "two hundred twelve million, one hundred five thousand, five hundred forty-five".