212118481 has 4 divisors (see below), whose sum is σ = 212150452. Its totient is φ = 212086512.

The previous prime is 212118457. The next prime is 212118493. The reversal of 212118481 is 184811212.

212118481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5017600 + 207100881 = 2240^2 + 14391^2 .

It is a cyclic number.

It is not a de Polignac number, because 212118481 - 2⁷ = 212118353 is a prime.

It is a super-2 number, since 2×212118481² = 89988499963494722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212113481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1890 + ... + 20683.

It is an arithmetic number, because the mean of its divisors is an integer number (53037613).

Almost surely, 2^212118481 is an apocalyptic number.

It is an amenable number.

212118481 is a deficient number, since it is larger than the sum of its proper divisors (31971).

212118481 is an equidigital number, since it uses as much as digits as its factorization.

212118481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31970.

The product of its digits is 1024, while the sum is 28.

The square root of 212118481 is about 14564.2878644992. The cubic root of 212118481 is about 596.3842553462.

Adding to 212118481 its reverse (184811212), we get a palindrome (396929693).

It can be divided in two parts, 21211 and 8481, that added together give a palindrome (29692).

The spelling of 212118481 in words is "two hundred twelve million, one hundred eighteen thousand, four hundred eighty-one".