212205045 has 32 divisors (see below), whose sum is σ = 368323200. Its totient is φ = 103705344.

The previous prime is 212205023. The next prime is 212205109. The reversal of 212205045 is 540502212.

It is a happy number.

It is not a de Polignac number, because 212205045 - 2¹⁴ = 212188661 is a prime.

It is a super-2 number, since 2×212205045² = 90061962246904050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23191 + ... + 31019.

It is an arithmetic number, because the mean of its divisors is an integer number (11510100).

Almost surely, 2^212205045 is an apocalyptic number.

It is an amenable number.

212205045 is a deficient number, since it is larger than the sum of its proper divisors (156118155).

212205045 is a wasteful number, since it uses less digits than its factorization.

212205045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7989.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 212205045 is about 14567.2593510241. The cubic root of 212205045 is about 596.4653709966.

Adding to 212205045 its reverse (540502212), we get a palindrome (752707257).

The spelling of 212205045 in words is "two hundred twelve million, two hundred five thousand, forty-five".