84066021 has 12 divisors (see below), whose sum is σ = 130769548. Its totient is φ = 51732864.

The previous prime is 84066019. The next prime is 84066029. The reversal of 84066021 is 12066048.

It can be written as a sum of positive squares in 2 ways, for example, as 17969121 + 66096900 = 4239^2 + 8130^2 .

It is not a de Polignac number, because 84066021 - 2¹ = 84066019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84066029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 359140 + ... + 359373.

Almost surely, 2^84066021 is an apocalyptic number.

It is an amenable number.

84066021 is a deficient number, since it is larger than the sum of its proper divisors (46703527).

84066021 is a wasteful number, since it uses less digits than its factorization.

84066021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718532 (or 718529 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 84066021 is about 9168.7524233126. The cubic root of 84066021 is about 438.0666221296.

Adding to 84066021 its sum of digits (27), we get a palindrome (84066048).

The spelling of 84066021 in words is "eighty-four million, sixty-six thousand, twenty-one".