212423445 has 32 divisors (see below), whose sum is σ = 406694400. Its totient is φ = 104576832.

The previous prime is 212423441. The next prime is 212423473. The reversal of 212423445 is 544324212.

212423445 is a `hidden beast` number, since 212 + 4 + 2 + 3 + 445 = 666.

It is not a de Polignac number, because 212423445 - 2² = 212423441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212423441) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 58765 + ... + 62274.

It is an arithmetic number, because the mean of its divisors is an integer number (12709200).

Almost surely, 2^212423445 is an apocalyptic number.

It is an amenable number.

212423445 is a deficient number, since it is larger than the sum of its proper divisors (194270955).

212423445 is a wasteful number, since it uses less digits than its factorization.

212423445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121066 (or 121060 counting only the distinct ones).

The product of its digits is 7680, while the sum is 27.

The square root of 212423445 is about 14574.7536857403. The cubic root of 212423445 is about 596.6699268814.

Adding to 212423445 its reverse (544324212), we get a palindrome (756747657).

The spelling of 212423445 in words is "two hundred twelve million, four hundred twenty-three thousand, four hundred forty-five".