212044421 has 2 divisors, whose sum is σ = 212044422. Its totient is φ = 212044420.

The previous prime is 212044403. The next prime is 212044457. The reversal of 212044421 is 124440212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211120900 + 923521 = 14530^2 + 961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212044421 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 212044393 and 212044402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212044471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106022210 + 106022211.

It is an arithmetic number, because the mean of its divisors is an integer number (106022211).

Almost surely, 2^212044421 is an apocalyptic number.

It is an amenable number.

212044421 is a deficient number, since it is larger than the sum of its proper divisors (1).

212044421 is an equidigital number, since it uses as much as digits as its factorization.

212044421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 212044421 is about 14561.7451220656. The cubic root of 212044421 is about 596.3148391735.

Adding to 212044421 its reverse (124440212), we get a palindrome (336484633).

The spelling of 212044421 in words is "two hundred twelve million, forty-four thousand, four hundred twenty-one".