1230220221 has 4 divisors (see below), whose sum is σ = 1640293632. Its totient is φ = 820146812.

The previous prime is 1230220217. The next prime is 1230220231. The reversal of 1230220221 is 1220220321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1220220321 = 3 ⋅406740107.

It is a cyclic number.

It is not a de Polignac number, because 1230220221 - 2² = 1230220217 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1230220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230220231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205036701 + ... + 205036706.

It is an arithmetic number, because the mean of its divisors is an integer number (410073408).

Almost surely, 2^1230220221 is an apocalyptic number.

It is an amenable number.

1230220221 is a deficient number, since it is larger than the sum of its proper divisors (410073411).

1230220221 is an equidigital number, since it uses as much as digits as its factorization.

1230220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410073410.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1230220221 is about 35074.4953064189. The cubic root of 1230220221 is about 1071.5052100126.

Adding to 1230220221 its reverse (1220220321), we get a palindrome (2450440542).

It can be divided in two parts, 12302 and 20221, that added together give a palindrome (32523).

The spelling of 1230220221 in words is "one billion, two hundred thirty million, two hundred twenty thousand, two hundred twenty-one".