84021617 has 4 divisors (see below), whose sum is σ = 84048240. Its totient is φ = 83994996.

The previous prime is 84021611. The next prime is 84021631. The reversal of 84021617 is 71612048.

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 a de Polignac number, because none of the positive numbers 2^k-84021617 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 84021617.

It is not an unprimeable number, because it can be changed into a prime (84021611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7823 + ... + 15140.

It is an arithmetic number, because the mean of its divisors is an integer number (21012060).

Almost surely, 2^84021617 is an apocalyptic number.

It is an amenable number.

84021617 is a deficient number, since it is larger than the sum of its proper divisors (26623).

84021617 is a wasteful number, since it uses less digits than its factorization.

84021617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26622.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 84021617 is about 9166.3306180827. The cubic root of 84021617 is about 437.9894790464.

The spelling of 84021617 in words is "eighty-four million, twenty-one thousand, six hundred seventeen".