1232213221 has 4 divisors (see below), whose sum is σ = 1262267244. Its totient is φ = 1202159200.

The previous prime is 1232213207. The next prime is 1232213233. The reversal of 1232213221 is 1223122321.

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 589032900 + 643180321 = 24270^2 + 25361^2 .

It is a cyclic number.

It is not a de Polignac number, because 1232213221 - 2⁵ = 1232213189 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 (1232213321) 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, 15026950 + ... + 15027031.

It is an arithmetic number, because the mean of its divisors is an integer number (315566811).

Almost surely, 2^1232213221 is an apocalyptic number.

It is an amenable number.

1232213221 is a deficient number, since it is larger than the sum of its proper divisors (30054023).

1232213221 is an equidigital number, since it uses as much as digits as its factorization.

1232213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30054022.

The product of its digits is 288, while the sum is 19.

The square root of 1232213221 is about 35102.8947666713. The cubic root of 1232213221 is about 1072.0835231968.

Adding to 1232213221 its reverse (1223122321), we get a palindrome (2455335542).

The spelling of 1232213221 in words is "one billion, two hundred thirty-two million, two hundred thirteen thousand, two hundred twenty-one".