212521113 has 24 divisors (see below), whose sum is σ = 353403648. Its totient is φ = 120549312.

The previous prime is 212521109. The next prime is 212521123. The reversal of 212521113 is 311125212.

It is not a de Polignac number, because 212521113 - 2² = 212521109 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212521103) 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 23 ways as a sum of consecutive naturals, for example, 3681 + ... + 20942.

It is an arithmetic number, because the mean of its divisors is an integer number (14725152).

Almost surely, 2^212521113 is an apocalyptic number.

It is an amenable number.

212521113 is a deficient number, since it is larger than the sum of its proper divisors (140882535).

212521113 is a wasteful number, since it uses less digits than its factorization.

212521113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24773 (or 24770 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 212521113 is about 14578.1038890522. The cubic root of 212521113 is about 596.7613584548.

Adding to 212521113 its reverse (311125212), we get a palindrome (523646325).

The spelling of 212521113 in words is "two hundred twelve million, five hundred twenty-one thousand, one hundred thirteen".