221022685 has 16 divisors (see below), whose sum is σ = 286325424. Its totient is φ = 162819072.

The previous prime is 221022647. The next prime is 221022701. The reversal of 221022685 is 586220122.

It can be written as a sum of positive squares in 8 ways, for example, as 115734564 + 105288121 = 10758^2 + 10261^2 .

It is not a de Polignac number, because 221022685 - 2¹¹ = 221020637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24219 + ... + 32071.

It is an arithmetic number, because the mean of its divisors is an integer number (17895339).

Almost surely, 2^221022685 is an apocalyptic number.

It is an amenable number.

221022685 is a deficient number, since it is larger than the sum of its proper divisors (65302739).

221022685 is a wasteful number, since it uses less digits than its factorization.

221022685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8304.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 221022685 is about 14866.8317068567. The cubic root of 221022685 is about 604.6150455044.

The spelling of 221022685 in words is "two hundred twenty-one million, twenty-two thousand, six hundred eighty-five".