1211000020019 has 4 divisors (see below), whose sum is σ = 1211022933696. Its totient is φ = 1210977106344.

The previous prime is 1211000020007. The next prime is 1211000020057. The reversal of 1211000020019 is 9100200001121.

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 1211000020019 - 2¹² = 1211000015923 is a prime.

It is a super-2 number, since 2×1211000020019² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211000019979 and 1211000020006.

It is not an unprimeable number, because it can be changed into a prime (1211000020319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11377379 + ... + 11483324.

It is an arithmetic number, because the mean of its divisors is an integer number (302755733424).

Almost surely, 2^{1211000020019} is an apocalyptic number.

1211000020019 is a deficient number, since it is larger than the sum of its proper divisors (22913677).

1211000020019 is an equidigital number, since it uses as much as digits as its factorization.

1211000020019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22913676.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 1211000020019 in words is "one trillion, two hundred eleven billion, twenty thousand, nineteen".