221422210 has 16 divisors (see below), whose sum is σ = 403039800. Its totient is φ = 87573376.

The previous prime is 221422207. The next prime is 221422211. The reversal of 221422210 is 12224122.

It can be written as a sum of positive squares in 4 ways, for example, as 155276521 + 66145689 = 12461^2 + 8133^2 .

It is not an unprimeable number, because it can be changed into a prime (221422211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123505 + ... + 125284.

Almost surely, 2^221422210 is an apocalyptic number.

221422210 is a deficient number, since it is larger than the sum of its proper divisors (181617590).

221422210 is a wasteful number, since it uses less digits than its factorization.

221422210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248885.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 221422210 is about 14880.2624304815. The cubic root of 221422210 is about 604.9791309424.

Adding to 221422210 its reverse (12224122), we get a palindrome (233646332).

The spelling of 221422210 in words is "two hundred twenty-one million, four hundred twenty-two thousand, two hundred ten".