212208481 has 4 divisors (see below), whose sum is σ = 212365764. Its totient is φ = 212051200.

The previous prime is 212208439. The next prime is 212208509. The reversal of 212208481 is 184802212.

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 63856081 + 148352400 = 7991^2 + 12180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212208481 is a prime.

It is a super-2 number, since 2×212208481² = 90064878816654722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212208401) 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, 76600 + ... + 79321.

It is an arithmetic number, because the mean of its divisors is an integer number (53091441).

Almost surely, 2^212208481 is an apocalyptic number.

It is an amenable number.

212208481 is a deficient number, since it is larger than the sum of its proper divisors (157283).

212208481 is a wasteful number, since it uses less digits than its factorization.

212208481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157282.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 212208481 is about 14567.3772862516. The cubic root of 212208481 is about 596.4685902791.

The spelling of 212208481 in words is "two hundred twelve million, two hundred eight thousand, four hundred eighty-one".