84327421 has 2 divisors, whose sum is σ = 84327422. Its totient is φ = 84327420.

The previous prime is 84327413. The next prime is 84327427. The reversal of 84327421 is 12472348.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81812025 + 2515396 = 9045^2 + 1586^2 .

It is a cyclic number.

It is not a de Polignac number, because 84327421 - 2³ = 84327413 is a prime.

It is a super-2 number, since 2×84327421² = 14222227865022482, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84327427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42163710 + 42163711.

It is an arithmetic number, because the mean of its divisors is an integer number (42163711).

Almost surely, 2^84327421 is an apocalyptic number.

It is an amenable number.

84327421 is a deficient number, since it is larger than the sum of its proper divisors (1).

84327421 is an equidigital number, since it uses as much as digits as its factorization.

84327421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 31.

The square root of 84327421 is about 9182.9962975055. The cubic root of 84327421 is about 438.5202026588.

Adding to 84327421 its reverse (12472348), we get a palindrome (96799769).

It can be divided in two parts, 84327 and 421, that added together give a palindrome (84748).

The spelling of 84327421 in words is "eighty-four million, three hundred twenty-seven thousand, four hundred twenty-one".