212095021 has 2 divisors, whose sum is σ = 212095022. Its totient is φ = 212095020.

The previous prime is 212095019. The next prime is 212095027. The reversal of 212095021 is 120590212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170955625 + 41139396 = 13075^2 + 6414^2 .

It is a cyclic number.

It is not a de Polignac number, because 212095021 - 2¹ = 212095019 is a prime.

Together with 212095019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 212094983 and 212095001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212095027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106047510 + 106047511.

It is an arithmetic number, because the mean of its divisors is an integer number (106047511).

Almost surely, 2^212095021 is an apocalyptic number.

It is an amenable number.

212095021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212095021 is an equidigital number, since it uses as much as digits as its factorization.

212095021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 212095021 is about 14563.4824475467. The cubic root of 212095021 is about 596.3622681210.

The spelling of 212095021 in words is "two hundred twelve million, ninety-five thousand, twenty-one".