67210421 has 2 divisors, whose sum is σ = 67210422. Its totient is φ = 67210420.

The previous prime is 67210411. The next prime is 67210433. The reversal of 67210421 is 12401276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41088100 + 26122321 = 6410^2 + 5111^2 .

It is a cyclic number.

It is not a de Polignac number, because 67210421 - 2¹⁴ = 67194037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67210411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33605210 + 33605211.

It is an arithmetic number, because the mean of its divisors is an integer number (33605211).

Almost surely, 2^67210421 is an apocalyptic number.

It is an amenable number.

67210421 is a deficient number, since it is larger than the sum of its proper divisors (1).

67210421 is an equidigital number, since it uses as much as digits as its factorization.

67210421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 67210421 is about 8198.1962040439. The cubic root of 67210421 is about 406.5795572477.

Adding to 67210421 its reverse (12401276), we get a palindrome (79611697).

The spelling of 67210421 in words is "sixty-seven million, two hundred ten thousand, four hundred twenty-one".