85010221 has 2 divisors, whose sum is σ = 85010222. Its totient is φ = 85010220.

The previous prime is 85010197. The next prime is 85010243. The reversal of 85010221 is 12201058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79655625 + 5354596 = 8925^2 + 2314^2 .

It is a cyclic number.

It is not a de Polignac number, because 85010221 - 2⁹ = 85009709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85010021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42505110 + 42505111.

It is an arithmetic number, because the mean of its divisors is an integer number (42505111).

Almost surely, 2^85010221 is an apocalyptic number.

It is an amenable number.

85010221 is a deficient number, since it is larger than the sum of its proper divisors (1).

85010221 is an equidigital number, since it uses as much as digits as its factorization.

85010221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 85010221 is about 9220.0987521826. The cubic root of 85010221 is about 439.7005900373.

Adding to 85010221 its reverse (12201058), we get a palindrome (97211279).

The spelling of 85010221 in words is "eighty-five million, ten thousand, two hundred twenty-one".