1330221421 has 4 divisors (see below), whose sum is σ = 1336974012. Its totient is φ = 1323468832.

The previous prime is 1330221419. The next prime is 1330221443. The reversal of 1330221421 is 1241220331.

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 905408100 + 424813321 = 30090^2 + 20611^2 .

It is a cyclic number.

It is not a de Polignac number, because 1330221421 - 2¹ = 1330221419 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 (1330221821) 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, 3376000 + ... + 3376393.

It is an arithmetic number, because the mean of its divisors is an integer number (334243503).

Almost surely, 2^1330221421 is an apocalyptic number.

It is an amenable number.

1330221421 is a deficient number, since it is larger than the sum of its proper divisors (6752591).

1330221421 is an equidigital number, since it uses as much as digits as its factorization.

1330221421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6752590.

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

The square root of 1330221421 is about 36472.2006602289. The cubic root of 1330221421 is about 1099.7854735919.

Adding to 1330221421 its reverse (1241220331), we get a palindrome (2571441752).

The spelling of 1330221421 in words is "one billion, three hundred thirty million, two hundred twenty-one thousand, four hundred twenty-one".