222100221 has 32 divisors (see below), whose sum is σ = 345461760. Its totient is φ = 124310016.

The previous prime is 222100211. The next prime is 222100231. The reversal of 222100221 is 122001222.

It is an interprime number because it is at equal distance from previous prime (222100211) and next prime (222100231).

It is not a de Polignac number, because 222100221 - 2⁷ = 222100093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222100197 and 222100206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222100211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 217450 + ... + 218468.

It is an arithmetic number, because the mean of its divisors is an integer number (10795680).

Almost surely, 2^222100221 is an apocalyptic number.

222100221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

222100221 is a deficient number, since it is larger than the sum of its proper divisors (123361539).

222100221 is a wasteful number, since it uses less digits than its factorization.

222100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 222100221 is about 14903.0272428121. The cubic root of 222100221 is about 605.5959985196.

Adding to 222100221 its reverse (122001222), we get a palindrome (344101443).

The spelling of 222100221 in words is "two hundred twenty-two million, one hundred thousand, two hundred twenty-one".