84173121 has 8 divisors (see below), whose sum is σ = 124700960. Its totient is φ = 56115396.

The previous prime is 84173119. The next prime is 84173129. The reversal of 84173121 is 12137148.

It is not a de Polignac number, because 84173121 - 2¹ = 84173119 is a prime.

It is a super-2 number, since 2×84173121² = 14170228597761282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 3117523 = 84173121 / (8 + 4 + 1 + 7 + 3 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84173129) 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, 1558735 + ... + 1558788.

It is an arithmetic number, because the mean of its divisors is an integer number (15587620).

Almost surely, 2^84173121 is an apocalyptic number.

It is an amenable number.

84173121 is a deficient number, since it is larger than the sum of its proper divisors (40527839).

84173121 is a wasteful number, since it uses less digits than its factorization.

84173121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3117532 (or 3117526 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 84173121 is about 9174.5910535566. The cubic root of 84173121 is about 438.2525752838.

The spelling of 84173121 in words is "eighty-four million, one hundred seventy-three thousand, one hundred twenty-one".