1330522421 has 4 divisors (see below), whose sum is σ = 1330804812. Its totient is φ = 1330240032.

The previous prime is 1330522409. The next prime is 1330522433. The reversal of 1330522421 is 1242250331.

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

It is an interprime number because it is at equal distance from previous prime (1330522409) and next prime (1330522433).

It can be written as a sum of positive squares in 2 ways, for example, as 441588196 + 888934225 = 21014^2 + 29815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1330522421 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 (1330522451) 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, 134006 + ... + 143591.

It is an arithmetic number, because the mean of its divisors is an integer number (332701203).

Almost surely, 2^1330522421 is an apocalyptic number.

It is an amenable number.

1330522421 is a deficient number, since it is larger than the sum of its proper divisors (282391).

1330522421 is an equidigital number, since it uses as much as digits as its factorization.

1330522421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282390.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1330522421 is about 36476.3268572920. The cubic root of 1330522421 is about 1099.8684197984.

Adding to 1330522421 its reverse (1242250331), we get a palindrome (2572772752).

The spelling of 1330522421 in words is "one billion, three hundred thirty million, five hundred twenty-two thousand, four hundred twenty-one".