221222160 has 60 divisors (see below), whose sum is σ = 742940172. Its totient is φ = 58992384.

The previous prime is 221222153. The next prime is 221222167. The reversal of 221222160 is 61222122.

It is an interprime number because it is at equal distance from previous prime (221222153) and next prime (221222167).

It can be written as a sum of positive squares in 2 ways, for example, as 164249856 + 56972304 = 12816^2 + 7548^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (221222167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 152907 + ... + 154346.

Almost surely, 2^221222160 is an apocalyptic number.

221222160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221222160 is an abundant number, since it is smaller than the sum of its proper divisors (521718012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221222160 is a wasteful number, since it uses less digits than its factorization.

221222160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307272 (or 307263 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 221222160 is about 14873.5389198402. The cubic root of 221222160 is about 604.7968810203.

Adding to 221222160 its reverse (61222122), we get a palindrome (282444282).

The spelling of 221222160 in words is "two hundred twenty-one million, two hundred twenty-two thousand, one hundred sixty".