850000221 has 48 divisors (see below), whose sum is σ = 1520348544. Its totient is φ = 446487552.

The previous prime is 850000219. The next prime is 850000267. The reversal of 850000221 is 122000058.

It is not a de Polignac number, because 850000221 - 2¹ = 850000219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 850000194 and 850000203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (850000201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36825 + ... + 55281.

It is an arithmetic number, because the mean of its divisors is an integer number (31673928).

Almost surely, 2^850000221 is an apocalyptic number.

It is an amenable number.

850000221 is a deficient number, since it is larger than the sum of its proper divisors (670348323).

850000221 is a wasteful number, since it uses less digits than its factorization.

850000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18530 (or 18527 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 850000221 is about 29154.7632643450. The cubic root of 850000221 is about 947.2683192825.

Adding to 850000221 its reverse (122000058), we get a palindrome (972000279).

The spelling of 850000221 in words is "eight hundred fifty million, two hundred twenty-one", and thus it is an aban number.