21031200019 has 2 divisors, whose sum is σ = 21031200020. Its totient is φ = 21031200018.

The previous prime is 21031199999. The next prime is 21031200061. The reversal of 21031200019 is 91000213012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21031200019 - 2²⁵ = 20997645587 is a prime.

It is a super-2 number, since 2×21031200019² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21031199969 and 21031200005.

It is not a weakly prime, because it can be changed into another prime (21031200419) 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, 10515600009 + 10515600010.

It is an arithmetic number, because the mean of its divisors is an integer number (10515600010).

Almost surely, 2^21031200019 is an apocalyptic number.

21031200019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031200019 is an equidigital number, since it uses as much as digits as its factorization.

21031200019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The spelling of 21031200019 in words is "twenty-one billion, thirty-one million, two hundred thousand, nineteen".