1330477721 has 4 divisors (see below), whose sum is σ = 1331832192. Its totient is φ = 1329123252.

The previous prime is 1330477703. The next prime is 1330477723. The reversal of 1330477721 is 1277740331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1330477721 - 2⁶ = 1330477657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1330477723) 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, 675761 + ... + 677726.

It is an arithmetic number, because the mean of its divisors is an integer number (332958048).

Almost surely, 2^1330477721 is an apocalyptic number.

It is an amenable number.

1330477721 is a deficient number, since it is larger than the sum of its proper divisors (1354471).

1330477721 is an equidigital number, since it uses as much as digits as its factorization.

1330477721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354470.

The product of its (nonzero) digits is 24696, while the sum is 35.

The square root of 1330477721 is about 36475.7141259770. The cubic root of 1330477721 is about 1099.8561026644.

The spelling of 1330477721 in words is "one billion, three hundred thirty million, four hundred seventy-seven thousand, seven hundred twenty-one".