1338165021 has 4 divisors (see below), whose sum is σ = 1784220032. Its totient is φ = 892110012.

The previous prime is 1338164983. The next prime is 1338165029. The reversal of 1338165021 is 1205618331.

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 not a de Polignac number, because 1338165021 - 2⁶ = 1338164957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1338165021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338165029) 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 in 3 ways as a sum of consecutive naturals, for example, 223027501 + ... + 223027506.

It is an arithmetic number, because the mean of its divisors is an integer number (446055008).

Almost surely, 2^1338165021 is an apocalyptic number.

It is an amenable number.

1338165021 is a deficient number, since it is larger than the sum of its proper divisors (446055011).

1338165021 is an equidigital number, since it uses as much as digits as its factorization.

1338165021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446055010.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1338165021 is about 36580.9379458756. The cubic root of 1338165021 is about 1101.9703037003.

The spelling of 1338165021 in words is "one billion, three hundred thirty-eight million, one hundred sixty-five thousand, twenty-one".