213141421 has 2 divisors, whose sum is σ = 213141422. Its totient is φ = 213141420.

The previous prime is 213141407. The next prime is 213141443. The reversal of 213141421 is 124141312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212838921 + 302500 = 14589^2 + 550^2 .

It is a cyclic number.

It is not a de Polignac number, because 213141421 - 2⁵ = 213141389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213141451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106570710 + 106570711.

It is an arithmetic number, because the mean of its divisors is an integer number (106570711).

Almost surely, 2^213141421 is an apocalyptic number.

It is an amenable number.

213141421 is a deficient number, since it is larger than the sum of its proper divisors (1).

213141421 is an equidigital number, since it uses as much as digits as its factorization.

213141421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 19.

The square root of 213141421 is about 14599.3637190119. The cubic root of 213141421 is about 597.3414047777.

Adding to 213141421 its reverse (124141312), we get a palindrome (337282733).

It can be divided in two parts, 21 and 3141421, that multiplied together give a triangular number (65969841 = T₁₁₄₈₆).

The spelling of 213141421 in words is "two hundred thirteen million, one hundred forty-one thousand, four hundred twenty-one".