212203021 has 2 divisors, whose sum is σ = 212203022. Its totient is φ = 212203020.

The previous prime is 212203007. The next prime is 212203087. The reversal of 212203021 is 120302212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153512100 + 58690921 = 12390^2 + 7661^2 .

It is a cyclic number.

It is not a de Polignac number, because 212203021 - 2⁵ = 212202989 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 212202992 and 212203010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212203721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106101510 + 106101511.

It is an arithmetic number, because the mean of its divisors is an integer number (106101511).

Almost surely, 2^212203021 is an apocalyptic number.

It is an amenable number.

212203021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212203021 is an equidigital number, since it uses as much as digits as its factorization.

212203021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 212203021 is about 14567.1898800009. The cubic root of 212203021 is about 596.4634746393.

Adding to 212203021 its reverse (120302212), we get a palindrome (332505233).

The spelling of 212203021 in words is "two hundred twelve million, two hundred three thousand, twenty-one".