212855481 has 12 divisors (see below), whose sum is σ = 309806640. Its totient is φ = 140819640.

The previous prime is 212855471. The next prime is 212855497. The reversal of 212855481 is 184558212.

212855481 is a `hidden beast` number, since 2 + 1 + 28 + 554 + 81 = 666.

It is not a de Polignac number, because 212855481 - 2²¹ = 210758329 is a prime.

It is a super-2 number, since 2×212855481² = 90614911583482722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212855411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89091 + ... + 91448.

It is an arithmetic number, because the mean of its divisors is an integer number (25817220).

Almost surely, 2^212855481 is an apocalyptic number.

It is an amenable number.

212855481 is a deficient number, since it is larger than the sum of its proper divisors (96951159).

212855481 is a wasteful number, since it uses less digits than its factorization.

212855481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180676 (or 180673 counting only the distinct ones).

The product of its digits is 25600, while the sum is 36.

The square root of 212855481 is about 14589.5675398553. The cubic root of 212855481 is about 597.0741639975.

The spelling of 212855481 in words is "two hundred twelve million, eight hundred fifty-five thousand, four hundred eighty-one".