212424021 has 24 divisors (see below), whose sum is σ = 325443456. Its totient is φ = 133230240.

The previous prime is 212424019. The next prime is 212424073. The reversal of 212424021 is 120424212.

212424021 is a `hidden beast` number, since 21 + 242 + 402 + 1 = 666.

212424021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212424021 - 2¹ = 212424019 is a prime.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 212423985 and 212424003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212424001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4216 + ... + 21038.

It is an arithmetic number, because the mean of its divisors is an integer number (13560144).

Almost surely, 2^212424021 is an apocalyptic number.

It is an amenable number.

212424021 is a deficient number, since it is larger than the sum of its proper divisors (113019435).

212424021 is a wasteful number, since it uses less digits than its factorization.

212424021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16913 (or 16910 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 212424021 is about 14574.7734459236. The cubic root of 212424021 is about 596.6704661840.

Adding to 212424021 its reverse (120424212), we get a palindrome (332848233).

The spelling of 212424021 in words is "two hundred twelve million, four hundred twenty-four thousand, twenty-one".