212134421 has 2 divisors, whose sum is σ = 212134422. Its totient is φ = 212134420.

The previous prime is 212134409. The next prime is 212134427. The reversal of 212134421 is 124431212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186022321 + 26112100 = 13639^2 + 5110^2 .

It is a cyclic number.

It is not a de Polignac number, because 212134421 - 2¹⁸ = 211872277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212134393 and 212134402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212134427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106067210 + 106067211.

It is an arithmetic number, because the mean of its divisors is an integer number (106067211).

Almost surely, 2^212134421 is an apocalyptic number.

It is an amenable number.

212134421 is a deficient number, since it is larger than the sum of its proper divisors (1).

212134421 is an equidigital number, since it uses as much as digits as its factorization.

212134421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 20.

The square root of 212134421 is about 14564.8350831721. The cubic root of 212134421 is about 596.3991937380.

Adding to 212134421 its reverse (124431212), we get a palindrome (336565633).

The spelling of 212134421 in words is "two hundred twelve million, one hundred thirty-four thousand, four hundred twenty-one".