1335421721 has 2 divisors, whose sum is σ = 1335421722. Its totient is φ = 1335421720.

The previous prime is 1335421663. The next prime is 1335421781. The reversal of 1335421721 is 1271245331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1036131721 + 299290000 = 32189^2 + 17300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1335421721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1335421781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 667710860 + 667710861.

It is an arithmetic number, because the mean of its divisors is an integer number (667710861).

Almost surely, 2^1335421721 is an apocalyptic number.

It is an amenable number.

1335421721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1335421721 is an equidigital number, since it uses as much as digits as its factorization.

1335421721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 29.

The square root of 1335421721 is about 36543.4224040387. The cubic root of 1335421721 is about 1101.2167585521.

The spelling of 1335421721 in words is "one billion, three hundred thirty-five million, four hundred twenty-one thousand, seven hundred twenty-one".