67421213 has 2 divisors, whose sum is σ = 67421214. Its totient is φ = 67421212.

The previous prime is 67421209. The next prime is 67421219. The reversal of 67421213 is 31212476.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56145049 + 11276164 = 7493^2 + 3358^2 .

It is a cyclic number.

It is not a de Polignac number, because 67421213 - 2² = 67421209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67421219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33710606 + 33710607.

It is an arithmetic number, because the mean of its divisors is an integer number (33710607).

Almost surely, 2^67421213 is an apocalyptic number.

It is an amenable number.

67421213 is a deficient number, since it is larger than the sum of its proper divisors (1).

67421213 is an equidigital number, since it uses as much as digits as its factorization.

67421213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 26.

The square root of 67421213 is about 8211.0421384864. The cubic root of 67421213 is about 407.0041653915.

Adding to 67421213 its reverse (31212476), we get a palindrome (98633689).

The spelling of 67421213 in words is "sixty-seven million, four hundred twenty-one thousand, two hundred thirteen".