1211200021019 has 2 divisors, whose sum is σ = 1211200021020. Its totient is φ = 1211200021018.

The previous prime is 1211200020977. The next prime is 1211200021033. The reversal of 1211200021019 is 9101200021121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211200021019 is a prime.

It is a super-2 number, since 2×1211200021019² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1211200026019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605600010509 + 605600010510.

It is an arithmetic number, because the mean of its divisors is an integer number (605600010510).

Almost surely, 2^{1211200021019} is an apocalyptic number.

1211200021019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211200021019 is an equidigital number, since it uses as much as digits as its factorization.

1211200021019 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 20.

The spelling of 1211200021019 in words is "one trillion, two hundred eleven billion, two hundred million, twenty-one thousand, nineteen".