212321442 has 16 divisors (see below), whose sum is σ = 424827360. Its totient is φ = 70743072.

The previous prime is 212321413. The next prime is 212321443. The reversal of 212321442 is 244123212.

It is not an unprimeable number, because it can be changed into a prime (212321443) 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 7 ways as a sum of consecutive naturals, for example, 10638 + ... + 23190.

It is an arithmetic number, because the mean of its divisors is an integer number (26551710).

Almost surely, 2^212321442 is an apocalyptic number.

212321442 is an abundant number, since it is smaller than the sum of its proper divisors (212505918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212321442 is a wasteful number, since it uses less digits than its factorization.

212321442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15377.

The product of its digits is 768, while the sum is 21.

The square root of 212321442 is about 14571.2539611387. The cubic root of 212321442 is about 596.5744071882.

Adding to 212321442 its reverse (244123212), we get a palindrome (456444654).

The spelling of 212321442 in words is "two hundred twelve million, three hundred twenty-one thousand, four hundred forty-two".