1332312221 has 4 divisors (see below), whose sum is σ = 1339673244. Its totient is φ = 1324951200.

The previous prime is 1332312199. The next prime is 1332312277. The reversal of 1332312221 is 1222132331.

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 441588196 + 890724025 = 21014^2 + 29845^2 .

It is a cyclic number.

It is not a de Polignac number, because 1332312221 - 2¹⁴ = 1332295837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1332312193 and 1332312202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1332012221) 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, 3680240 + ... + 3680601.

It is an arithmetic number, because the mean of its divisors is an integer number (334918311).

Almost surely, 2^1332312221 is an apocalyptic number.

It is an amenable number.

1332312221 is a deficient number, since it is larger than the sum of its proper divisors (7361023).

1332312221 is an equidigital number, since it uses as much as digits as its factorization.

1332312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7361022.

The product of its digits is 432, while the sum is 20.

The square root of 1332312221 is about 36500.8523325141. The cubic root of 1332312221 is about 1100.3613746558.

Adding to 1332312221 its reverse (1222132331), we get a palindrome (2554444552).

The spelling of 1332312221 in words is "one billion, three hundred thirty-two million, three hundred twelve thousand, two hundred twenty-one".