21211200019 has 2 divisors, whose sum is σ = 21211200020. Its totient is φ = 21211200018.

The previous prime is 21211200011. The next prime is 21211200061. The reversal of 21211200019 is 91000211212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211200019 - 2³ = 21211200011 is a prime.

It is a super-2 number, since 2×21211200019² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21211199969 and 21211200005.

It is not a weakly prime, because it can be changed into another prime (21211200011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605600009 + 10605600010.

It is an arithmetic number, because the mean of its divisors is an integer number (10605600010).

Almost surely, 2^21211200019 is an apocalyptic number.

21211200019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211200019 is an equidigital number, since it uses as much as digits as its factorization.

21211200019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 21211200019 in words is "twenty-one billion, two hundred eleven million, two hundred thousand, nineteen".