1220110221 has 16 divisors (see below), whose sum is σ = 1799705088. Its totient is φ = 729044400.

The previous prime is 1220110219. The next prime is 1220110223.

1220110221 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (1220110219) and next prime (1220110223).

It is not a de Polignac number, because 1220110221 - 2¹ = 1220110219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220110197 and 1220110206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220110223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258031 + ... + 262716.

It is an arithmetic number, because the mean of its divisors is an integer number (112481568).

Almost surely, 2^1220110221 is an apocalyptic number.

1220110221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220110221 is a deficient number, since it is larger than the sum of its proper divisors (579594867).

1220110221 is a wasteful number, since it uses less digits than its factorization.

1220110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520832.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1220110221 is about 34930.0761665359. The cubic root of 1220110221 is about 1068.5619079819.

It can be divided in two parts, 12201 and 10221, that added together give a palindrome (22422).

The spelling of 1220110221 in words is "one billion, two hundred twenty million, one hundred ten thousand, two hundred twenty-one".