21071382019 has 4 divisors (see below), whose sum is σ = 21519709344. Its totient is φ = 20623054696.

The previous prime is 21071382011. The next prime is 21071382023. The reversal of 21071382019 is 91028317012.

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

It is a cyclic number.

It is not a de Polignac number, because 21071382019 - 2³ = 21071382011 is a prime.

It is a super-2 number, since 2×21071382019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21071382011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224163592 + ... + 224163685.

It is an arithmetic number, because the mean of its divisors is an integer number (5379927336).

Almost surely, 2^21071382019 is an apocalyptic number.

21071382019 is a deficient number, since it is larger than the sum of its proper divisors (448327325).

21071382019 is an equidigital number, since it uses as much as digits as its factorization.

21071382019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448327324.

The product of its (nonzero) digits is 6048, while the sum is 34.

The spelling of 21071382019 in words is "twenty-one billion, seventy-one million, three hundred eighty-two thousand, nineteen".