212425021 has 2 divisors, whose sum is σ = 212425022. Its totient is φ = 212425020.

The previous prime is 212425019. The next prime is 212425049. The reversal of 212425021 is 120524212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191822500 + 20602521 = 13850^2 + 4539^2 .

It is a cyclic number.

It is not a de Polignac number, because 212425021 - 2¹ = 212425019 is a prime.

Together with 212425019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 212425021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212425001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106212510 + 106212511.

It is an arithmetic number, because the mean of its divisors is an integer number (106212511).

Almost surely, 2^212425021 is an apocalyptic number.

It is an amenable number.

212425021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212425021 is an equidigital number, since it uses as much as digits as its factorization.

212425021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 212425021 is about 14574.8077517338. The cubic root of 212425021 is about 596.6714024710.

Adding to 212425021 its reverse (120524212), we get a palindrome (332949233).

The spelling of 212425021 in words is "two hundred twelve million, four hundred twenty-five thousand, twenty-one".