10221805 has 16 divisors (see below), whose sum is σ = 13745664. Its totient is φ = 7231680.

The previous prime is 10221803. The next prime is 10221853. The reversal of 10221805 is 50812201.

It is not a de Polignac number, because 10221805 - 2¹ = 10221803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 477 + ... + 4546.

It is an arithmetic number, because the mean of its divisors is an integer number (859104).

Almost surely, 2^10221805 is an apocalyptic number.

It is an amenable number.

10221805 is a deficient number, since it is larger than the sum of its proper divisors (3523859).

10221805 is a wasteful number, since it uses less digits than its factorization.

10221805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5076.

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

The square root of 10221805 is about 3197.1557672406. The cubic root of 10221805 is about 217.0247163335.

It can be divided in two parts, 10221 and 805, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 10221805 in words is "ten million, two hundred twenty-one thousand, eight hundred five".