84130921 has 4 divisors (see below), whose sum is σ = 96149632. Its totient is φ = 72112212.

The previous prime is 84130889. The next prime is 84130927. The reversal of 84130921 is 12903148.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84130921 - 2⁵ = 84130889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84130921.

It is not an unprimeable number, because it can be changed into a prime (84130927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6009345 + ... + 6009358.

It is an arithmetic number, because the mean of its divisors is an integer number (24037408).

Almost surely, 2^84130921 is an apocalyptic number.

It is an amenable number.

84130921 is a deficient number, since it is larger than the sum of its proper divisors (12018711).

84130921 is a wasteful number, since it uses less digits than its factorization.

84130921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12018710.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 84130921 is about 9172.2909352026. The cubic root of 84130921 is about 438.1793240685.

The spelling of 84130921 in words is "eighty-four million, one hundred thirty thousand, nine hundred twenty-one".