86042821 has 4 divisors (see below), whose sum is σ = 86158144. Its totient is φ = 85927500.

The previous prime is 86042819. The next prime is 86042851. The reversal of 86042821 is 12824068.

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 86042821 - 2¹ = 86042819 is a prime.

It is a super-5 number, since 5×86042821⁵ (a number of 41 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86042851) 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 3 ways as a sum of consecutive naturals, for example, 56535 + ... + 58036.

It is an arithmetic number, because the mean of its divisors is an integer number (21539536).

Almost surely, 2^86042821 is an apocalyptic number.

It is an amenable number.

86042821 is a deficient number, since it is larger than the sum of its proper divisors (115323).

86042821 is a wasteful number, since it uses less digits than its factorization.

86042821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115322.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 86042821 is about 9275.9269617651. The cubic root of 86042821 is about 441.4737445947.

Adding to 86042821 its reverse (12824068), we get a palindrome (98866889).

It can be divided in two parts, 860 and 42821, that added together give a square (43681 = 209²).

The spelling of 86042821 in words is "eighty-six million, forty-two thousand, eight hundred twenty-one".