21037876019 has 2 divisors, whose sum is σ = 21037876020. Its totient is φ = 21037876018.

The previous prime is 21037875977. The next prime is 21037876037. The reversal of 21037876019 is 91067873012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21037876019 - 2²⁴ = 21021098803 is a prime.

It is a super-2 number, since 2×21037876019² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21037876099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10518938009 + 10518938010.

It is an arithmetic number, because the mean of its divisors is an integer number (10518938010).

Almost surely, 2^21037876019 is an apocalyptic number.

21037876019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21037876019 is an equidigital number, since it uses as much as digits as its factorization.

21037876019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 44.

The spelling of 21037876019 in words is "twenty-one billion, thirty-seven million, eight hundred seventy-six thousand, nineteen".