84032421 has 32 divisors (see below), whose sum is σ = 129454080. Its totient is φ = 47952000.

The previous prime is 84032387. The next prime is 84032453. The reversal of 84032421 is 12423048.

It is not a de Polignac number, because 84032421 - 2⁷ = 84032293 is a prime.

It is a super-2 number, since 2×84032421² = 14122895558242482, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 84032391 and 84032400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84032321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139521 + ... + 140121.

It is an arithmetic number, because the mean of its divisors is an integer number (4045440).

Almost surely, 2^84032421 is an apocalyptic number.

It is an amenable number.

84032421 is a deficient number, since it is larger than the sum of its proper divisors (45421659).

84032421 is a wasteful number, since it uses less digits than its factorization.

84032421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 84032421 is about 9166.9199298347. The cubic root of 84032421 is about 438.0082513406.

Adding to 84032421 its reverse (12423048), we get a palindrome (96455469).

The spelling of 84032421 in words is "eighty-four million, thirty-two thousand, four hundred twenty-one".