86474021 has 2 divisors, whose sum is σ = 86474022. Its totient is φ = 86474020.

The previous prime is 86474009. The next prime is 86474023. The reversal of 86474021 is 12047468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46922500 + 39551521 = 6850^2 + 6289^2 .

It is a cyclic number.

It is not a de Polignac number, because 86474021 - 2¹⁸ = 86211877 is a prime.

It is a super-3 number, since 3×86474021³ (a number of 25 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 86474023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86474023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43237010 + 43237011.

It is an arithmetic number, because the mean of its divisors is an integer number (43237011).

Almost surely, 2^86474021 is an apocalyptic number.

It is an amenable number.

86474021 is a deficient number, since it is larger than the sum of its proper divisors (1).

86474021 is an equidigital number, since it uses as much as digits as its factorization.

86474021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 86474021 is about 9299.1408742959. The cubic root of 86474021 is about 442.2099918079.

The spelling of 86474021 in words is "eighty-six million, four hundred seventy-four thousand, twenty-one".