84023521 has 2 divisors, whose sum is σ = 84023522. Its totient is φ = 84023520.

The previous prime is 84023509. The next prime is 84023587. The reversal of 84023521 is 12532048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68310225 + 15713296 = 8265^2 + 3964^2 .

It is a cyclic number.

It is not a de Polignac number, because 84023521 - 2¹³ = 84015329 is a prime.

It is not a weakly prime, because it can be changed into another prime (84021521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42011760 + 42011761.

It is an arithmetic number, because the mean of its divisors is an integer number (42011761).

Almost surely, 2^84023521 is an apocalyptic number.

It is an amenable number.

84023521 is a deficient number, since it is larger than the sum of its proper divisors (1).

84023521 is an equidigital number, since it uses as much as digits as its factorization.

84023521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 84023521 is about 9166.4344758472. The cubic root of 84023521 is about 437.9927874239.

Adding to 84023521 its reverse (12532048), we get a palindrome (96555569).

The spelling of 84023521 in words is "eighty-four million, twenty-three thousand, five hundred twenty-one".