84216921 has 8 divisors (see below), whose sum is σ = 115324224. Its totient is φ = 54627120.

The previous prime is 84216907. The next prime is 84216953. The reversal of 84216921 is 12961248.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 84216921 - 2⁶ = 84216857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (84216971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379245 + ... + 379466.

It is an arithmetic number, because the mean of its divisors is an integer number (14415528).

Almost surely, 2^84216921 is an apocalyptic number.

It is an amenable number.

84216921 is a deficient number, since it is larger than the sum of its proper divisors (31107303).

84216921 is a wasteful number, since it uses less digits than its factorization.

84216921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758751.

The product of its digits is 6912, while the sum is 33.

The square root of 84216921 is about 9176.9777704863. The cubic root of 84216921 is about 438.3285779080.

The spelling of 84216921 in words is "eighty-four million, two hundred sixteen thousand, nine hundred twenty-one".