212013421 has 2 divisors, whose sum is σ = 212013422. Its totient is φ = 212013420.

The previous prime is 212013407. The next prime is 212013469. The reversal of 212013421 is 124310212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210656196 + 1357225 = 14514^2 + 1165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212013421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212013395 and 212013404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212013121) 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, 106006710 + 106006711.

It is an arithmetic number, because the mean of its divisors is an integer number (106006711).

Almost surely, 2^212013421 is an apocalyptic number.

It is an amenable number.

212013421 is a deficient number, since it is larger than the sum of its proper divisors (1).

212013421 is an equidigital number, since it uses as much as digits as its factorization.

212013421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 212013421 is about 14560.6806502993. The cubic root of 212013421 is about 596.2857781858.

Adding to 212013421 its reverse (124310212), we get a palindrome (336323633).

The spelling of 212013421 in words is "two hundred twelve million, thirteen thousand, four hundred twenty-one".