1210220221 has 8 divisors (see below), whose sum is σ = 1383640704. Its totient is φ = 1036932720.

The previous prime is 1210220159. The next prime is 1210220227. The reversal of 1210220221 is 1220220121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1210220221 - 2⁹ = 1210219709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210220227) 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, 12910 + ... + 50863.

It is an arithmetic number, because the mean of its divisors is an integer number (172955088).

Almost surely, 2^1210220221 is an apocalyptic number.

It is an amenable number.

1210220221 is a deficient number, since it is larger than the sum of its proper divisors (173420483).

1210220221 is an equidigital number, since it uses as much as digits as its factorization.

1210220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66491.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1210220221 is about 34788.2195721483. The cubic root of 1210220221 is about 1065.6668796743. Note that the first 3 decimals are identical.

Adding to 1210220221 its reverse (1220220121), we get a palindrome (2430440342).

It can be divided in two parts, 12102 and 20221, that added together give a palindrome (32323).

The spelling of 1210220221 in words is "one billion, two hundred ten million, two hundred twenty thousand, two hundred twenty-one".