84021827 has 4 divisors (see below), whose sum is σ = 85399296. Its totient is φ = 82644360.

The previous prime is 84021823. The next prime is 84021859. The reversal of 84021827 is 72812048.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84021827 - 2² = 84021823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84021793 and 84021802.

It is not an unprimeable number, because it can be changed into a prime (84021823) 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, 688643 + ... + 688764.

It is an arithmetic number, because the mean of its divisors is an integer number (21349824).

Almost surely, 2^84021827 is an apocalyptic number.

84021827 is a deficient number, since it is larger than the sum of its proper divisors (1377469).

84021827 is a wasteful number, since it uses less digits than its factorization.

84021827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377468.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 84021827 is about 9166.3420730409. The cubic root of 84021827 is about 437.9898439435.

It can be divided in two parts, 84021 and 827, that added together give a palindrome (84848).

The spelling of 84021827 in words is "eighty-four million, twenty-one thousand, eight hundred twenty-seven".