212130454221 has 144 divisors (see below), whose sum is σ = 401001269760. Its totient is φ = 105355514880.

The previous prime is 212130454213. The next prime is 212130454229. The reversal of 212130454221 is 122454031212.

212130454221 is a `hidden beast` number, since 21 + 213 + 0 + 4 + 5 + 422 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (212130454213) and next prime (212130454229).

It is not a de Polignac number, because 212130454221 - 2³ = 212130454213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212130454229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 16423756 + ... + 16436666.

It is an arithmetic number, because the mean of its divisors is an integer number (2784731040).

Almost surely, 2^212130454221 is an apocalyptic number.

212130454221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212130454221 is a deficient number, since it is larger than the sum of its proper divisors (188870815539).

212130454221 is a wasteful number, since it uses less digits than its factorization.

212130454221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13016 (or 12990 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 212130454221 its reverse (122454031212), we get a palindrome (334584485433).

The spelling of 212130454221 in words is "two hundred twelve billion, one hundred thirty million, four hundred fifty-four thousand, two hundred twenty-one".