85668421 has 2 divisors, whose sum is σ = 85668422. Its totient is φ = 85668420.

The previous prime is 85668419. The next prime is 85668439. The reversal of 85668421 is 12486658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68973025 + 16695396 = 8305^2 + 4086^2 .

It is a cyclic number.

It is not a de Polignac number, because 85668421 - 2¹ = 85668419 is a prime.

Together with 85668419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85668481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42834210 + 42834211.

It is an arithmetic number, because the mean of its divisors is an integer number (42834211).

Almost surely, 2^85668421 is an apocalyptic number.

It is an amenable number.

85668421 is a deficient number, since it is larger than the sum of its proper divisors (1).

85668421 is an equidigital number, since it uses as much as digits as its factorization.

85668421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 40.

The square root of 85668421 is about 9255.7236886156. The cubic root of 85668421 is about 440.8324821420.

The spelling of 85668421 in words is "eighty-five million, six hundred sixty-eight thousand, four hundred twenty-one".