1230000221 has 4 divisors (see below), whose sum is σ = 1231397244. Its totient is φ = 1228603200.

The previous prime is 1230000209. The next prime is 1230000223. The reversal of 1230000221 is 1220000321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 271788196 + 958212025 = 16486^2 + 30955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1230000221 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 (1230000223) 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, 697190 + ... + 698951.

It is an arithmetic number, because the mean of its divisors is an integer number (307849311).

Almost surely, 2^1230000221 is an apocalyptic number.

It is an amenable number.

1230000221 is a deficient number, since it is larger than the sum of its proper divisors (1397023).

1230000221 is an equidigital number, since it uses as much as digits as its factorization.

1230000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397022.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1230000221 is about 35071.3589842196. The cubic root of 1230000221 is about 1071.4413338611.

Adding to 1230000221 its reverse (1220000321), we get a palindrome (2450000542).

The spelling of 1230000221 in words is "one billion, two hundred thirty million, two hundred twenty-one", and thus it is an aban number.