86065721221 has 4 divisors (see below), whose sum is σ = 86111722944. Its totient is φ = 86019719500.

The previous prime is 86065721173. The next prime is 86065721233. The reversal of 86065721221 is 12212756068.

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 86065721221 - 2³¹ = 83918237573 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 (86065721251) 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, 22998055 + ... + 23001796.

It is an arithmetic number, because the mean of its divisors is an integer number (21527930736).

Almost surely, 2^86065721221 is an apocalyptic number.

It is an amenable number.

86065721221 is a deficient number, since it is larger than the sum of its proper divisors (46001723).

86065721221 is a wasteful number, since it uses less digits than its factorization.

86065721221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46001722.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 86065721221 in words is "eighty-six billion, sixty-five million, seven hundred twenty-one thousand, two hundred twenty-one".