212147445 has 16 divisors (see below), whose sum is σ = 357301440. Its totient is φ = 107190144.

The previous prime is 212147401. The next prime is 212147449. The reversal of 212147445 is 544741212.

It is not a de Polignac number, because 212147445 - 2⁷ = 212147317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212147449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 371904 + ... + 372473.

It is an arithmetic number, because the mean of its divisors is an integer number (22331340).

Almost surely, 2^212147445 is an apocalyptic number.

It is an amenable number.

212147445 is a deficient number, since it is larger than the sum of its proper divisors (145153995).

212147445 is a wasteful number, since it uses less digits than its factorization.

212147445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744404.

The product of its digits is 8960, while the sum is 30.

The square root of 212147445 is about 14565.2821805827. The cubic root of 212147445 is about 596.4113988045.

Adding to 212147445 its reverse (544741212), we get a palindrome (756888657).

The spelling of 212147445 in words is "two hundred twelve million, one hundred forty-seven thousand, four hundred forty-five".