212142245 has 16 divisors (see below), whose sum is σ = 293518080. Its totient is φ = 144178944.

The previous prime is 212142223. The next prime is 212142247. The reversal of 212142245 is 542241212.

It is not a de Polignac number, because 212142245 - 2¹² = 212138149 is a prime.

It is a super-2 number, since 2×212142245² = 90008664227280050, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 212142245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212142247) 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 15 ways as a sum of consecutive naturals, for example, 22865 + ... + 30774.

It is an arithmetic number, because the mean of its divisors is an integer number (18344880).

Almost surely, 2^212142245 is an apocalyptic number.

It is an amenable number.

212142245 is a deficient number, since it is larger than the sum of its proper divisors (81375835).

212142245 is a wasteful number, since it uses less digits than its factorization.

212142245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53764.

The product of its digits is 1280, while the sum is 23.

The square root of 212142245 is about 14565.1036728202. The cubic root of 212142245 is about 596.4065258342.

Adding to 212142245 its reverse (542241212), we get a palindrome (754383457).

The spelling of 212142245 in words is "two hundred twelve million, one hundred forty-two thousand, two hundred forty-five".