74206421 has 2 divisors, whose sum is σ = 74206422. Its totient is φ = 74206420.

The previous prime is 74206409. The next prime is 74206427. The reversal of 74206421 is 12460247.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61858225 + 12348196 = 7865^2 + 3514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74206421 is a prime.

It is a Chen prime.

It is equal to p_4350554 and since 74206421 and 4350554 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74206427) 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, 37103210 + 37103211.

It is an arithmetic number, because the mean of its divisors is an integer number (37103211).

Almost surely, 2^74206421 is an apocalyptic number.

It is an amenable number.

74206421 is a deficient number, since it is larger than the sum of its proper divisors (1).

74206421 is an equidigital number, since it uses as much as digits as its factorization.

74206421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 74206421 is about 8614.3148886026. The cubic root of 74206421 is about 420.2236545010.

Adding to 74206421 its reverse (12460247), we get a palindrome (86666668).

The spelling of 74206421 in words is "seventy-four million, two hundred six thousand, four hundred twenty-one".