84084421 has 2 divisors, whose sum is σ = 84084422. Its totient is φ = 84084420.

The previous prime is 84084391. The next prime is 84084437. The reversal of 84084421 is 12448048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77193796 + 6890625 = 8786^2 + 2625^2 .

It is a cyclic number.

It is not a de Polignac number, because 84084421 - 2¹⁷ = 83953349 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84084491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42042210 + 42042211.

It is an arithmetic number, because the mean of its divisors is an integer number (42042211).

Almost surely, 2^84084421 is an apocalyptic number.

It is an amenable number.

84084421 is a deficient number, since it is larger than the sum of its proper divisors (1).

84084421 is an equidigital number, since it uses as much as digits as its factorization.

84084421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8192, while the sum is 31.

The square root of 84084421 is about 9169.7557764643. The cubic root of 84084421 is about 438.0985804950.

The spelling of 84084421 in words is "eighty-four million, eighty-four thousand, four hundred twenty-one".