84027921 has 4 divisors (see below), whose sum is σ = 112037232. Its totient is φ = 56018612.

The previous prime is 84027893. The next prime is 84027929. The reversal of 84027921 is 12972048.

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 84027921 - 2⁶ = 84027857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84027929) 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, 14004651 + ... + 14004656.

It is an arithmetic number, because the mean of its divisors is an integer number (28009308).

Almost surely, 2^84027921 is an apocalyptic number.

It is an amenable number.

84027921 is a deficient number, since it is larger than the sum of its proper divisors (28009311).

84027921 is a wasteful number, since it uses less digits than its factorization.

84027921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28009310.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 84027921 is about 9166.6744787845. The cubic root of 84027921 is about 438.0004326428. Note that the first 3 decimals are identical.

Adding to 84027921 its reverse (12972048), we get a palindrome (96999969).

It can be divided in two parts, 84027 and 921, that added together give a palindrome (84948).

The spelling of 84027921 in words is "eighty-four million, twenty-seven thousand, nine hundred twenty-one".