212243045 has 24 divisors (see below), whose sum is σ = 309220224. Its totient is φ = 136970496.

The previous prime is 212243029. The next prime is 212243077. The reversal of 212243045 is 540342212.

It is a happy number.

It is not a de Polignac number, because 212243045 - 2⁴ = 212243029 is a prime.

It is a super-2 number, since 2×212243045² = 90094220301744050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212243045.

It is a congruent 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 23 ways as a sum of consecutive naturals, for example, 377 + ... + 20606.

It is an arithmetic number, because the mean of its divisors is an integer number (12884176).

Almost surely, 2^212243045 is an apocalyptic number.

It is an amenable number.

212243045 is a deficient number, since it is larger than the sum of its proper divisors (96977179).

212243045 is a wasteful number, since it uses less digits than its factorization.

212243045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21029 (or 21012 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 212243045 is about 14568.5635873960. The cubic root of 212243045 is about 596.5009723043.

Adding to 212243045 its reverse (540342212), we get a palindrome (752585257).

The spelling of 212243045 in words is "two hundred twelve million, two hundred forty-three thousand, forty-five".