110101221 has 8 divisors (see below), whose sum is σ = 163112960. Its totient is φ = 73400796.

The previous prime is 110101217. The next prime is 110101237. The reversal of 110101221 is 122101011.

It is a happy number.

It is not a de Polignac number, because 110101221 - 2² = 110101217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (110101241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2038885 + ... + 2038938.

It is an arithmetic number, because the mean of its divisors is an integer number (20389120).

Almost surely, 2^110101221 is an apocalyptic number.

It is an amenable number.

110101221 is a deficient number, since it is larger than the sum of its proper divisors (53011739).

110101221 is an equidigital number, since it uses as much as digits as its factorization.

110101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4077832 (or 4077826 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 110101221 is about 10492.9128939489. The cubic root of 110101221 is about 479.2889080164.

Adding to 110101221 its reverse (122101011), we get a palindrome (232202232).

The spelling of 110101221 in words is "one hundred ten million, one hundred one thousand, two hundred twenty-one".