212444121 has 16 divisors (see below), whose sum is σ = 308029824. Its totient is φ = 129694464.

The previous prime is 212444093. The next prime is 212444129. The reversal of 212444121 is 121444212.

It is a de Polignac number, because none of the positive numbers 2^k-212444121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212444129) 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, 54405 + ... + 58178.

It is an arithmetic number, because the mean of its divisors is an integer number (19251864).

Almost surely, 2^212444121 is an apocalyptic number.

It is an amenable number.

212444121 is a deficient number, since it is larger than the sum of its proper divisors (95585703).

212444121 is a wasteful number, since it uses less digits than its factorization.

212444121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112640.

The product of its digits is 512, while the sum is 21.

The square root of 212444121 is about 14575.4629772093. The cubic root of 212444121 is about 596.6892849881.

Adding to 212444121 its reverse (121444212), we get a palindrome (333888333).

Subtracting from 212444121 its reverse (121444212), we obtain a palindrome (90999909).

The spelling of 212444121 in words is "two hundred twelve million, four hundred forty-four thousand, one hundred twenty-one".