84022521 has 24 divisors (see below), whose sum is σ = 123836832. Its totient is φ = 50635200.

The previous prime is 84022513. The next prime is 84022529. The reversal of 84022521 is 12522048.

It is an interprime number because it is at equal distance from previous prime (84022513) and next prime (84022529).

It is not a de Polignac number, because 84022521 - 2³ = 84022513 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 84022491 and 84022500.

It is not an unprimeable number, because it can be changed into a prime (84022529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76045 + ... + 77141.

It is an arithmetic number, because the mean of its divisors is an integer number (5159868).

Almost surely, 2^84022521 is an apocalyptic number.

It is an amenable number.

84022521 is a deficient number, since it is larger than the sum of its proper divisors (39814311).

84022521 is a wasteful number, since it uses less digits than its factorization.

84022521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333 (or 1322 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 84022521 is about 9166.3799288487. The cubic root of 84022521 is about 437.9910498369.

Adding to 84022521 its reverse (12522048), we get a palindrome (96544569).

The spelling of 84022521 in words is "eighty-four million, twenty-two thousand, five hundred twenty-one".