84136921 has 24 divisors (see below), whose sum is σ = 101132640. Its totient is φ = 69220800.

The previous prime is 84136907. The next prime is 84136933. The reversal of 84136921 is 12963148.

It is not a de Polignac number, because 84136921 - 2¹¹ = 84134873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84131921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110181 + ... + 110941.

It is an arithmetic number, because the mean of its divisors is an integer number (4213860).

Almost surely, 2^84136921 is an apocalyptic number.

It is an amenable number.

84136921 is a deficient number, since it is larger than the sum of its proper divisors (16995719).

84136921 is a wasteful number, since it uses less digits than its factorization.

84136921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837 (or 814 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 84136921 is about 9172.6180014214. The cubic root of 84136921 is about 438.1897404268.

The spelling of 84136921 in words is "eighty-four million, one hundred thirty-six thousand, nine hundred twenty-one".