84111621 has 16 divisors (see below), whose sum is σ = 127664640. Its totient is φ = 48759920.

The previous prime is 84111611. The next prime is 84111647. The reversal of 84111621 is 12611148.

It is not a de Polignac number, because 84111621 - 2⁹ = 84111109 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 84111591 and 84111600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84111611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54651 + ... + 56168.

It is an arithmetic number, because the mean of its divisors is an integer number (7979040).

Almost surely, 2^84111621 is an apocalyptic number.

It is an amenable number.

84111621 is a deficient number, since it is larger than the sum of its proper divisors (43553019).

84111621 is a wasteful number, since it uses less digits than its factorization.

84111621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110856.

The product of its digits is 384, while the sum is 24.

The square root of 84111621 is about 9171.2387930966. The cubic root of 84111621 is about 438.1458147570.

Adding to 84111621 its reverse (12611148), we get a palindrome (96722769).

The spelling of 84111621 in words is "eighty-four million, one hundred eleven thousand, six hundred twenty-one".