86942221 has 4 divisors (see below), whose sum is σ = 87172000. Its totient is φ = 86712444.

The previous prime is 86942213. The next prime is 86942237. The reversal of 86942221 is 12224968.

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 86942221 - 2³ = 86942213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86942201) 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, 114321 + ... + 115078.

It is an arithmetic number, because the mean of its divisors is an integer number (21793000).

Almost surely, 2^86942221 is an apocalyptic number.

It is an amenable number.

86942221 is a deficient number, since it is larger than the sum of its proper divisors (229779).

86942221 is a wasteful number, since it uses less digits than its factorization.

86942221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229778.

The product of its digits is 13824, while the sum is 34.

The square root of 86942221 is about 9324.2812591642. The cubic root of 86942221 is about 443.0066479171.

The spelling of 86942221 in words is "eighty-six million, nine hundred forty-two thousand, two hundred twenty-one".