86801021 has 2 divisors, whose sum is σ = 86801022. Its totient is φ = 86801020.

The previous prime is 86801017. The next prime is 86801041. The reversal of 86801021 is 12010868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74822500 + 11978521 = 8650^2 + 3461^2 .

It is a cyclic number.

It is not a de Polignac number, because 86801021 - 2² = 86801017 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86801041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43400510 + 43400511.

It is an arithmetic number, because the mean of its divisors is an integer number (43400511).

Almost surely, 2^86801021 is an apocalyptic number.

It is an amenable number.

86801021 is a deficient number, since it is larger than the sum of its proper divisors (1).

86801021 is an equidigital number, since it uses as much as digits as its factorization.

86801021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 86801021 is about 9316.7065532837. The cubic root of 86801021 is about 442.7666937969.

Adding to 86801021 its reverse (12010868), we get a palindrome (98811889).

The spelling of 86801021 in words is "eighty-six million, eight hundred one thousand, twenty-one".