1211200020019 has 4 divisors (see below), whose sum is σ = 1321309112760. Its totient is φ = 1101090927280.

The previous prime is 1211200019993. The next prime is 1211200020089. The reversal of 1211200020019 is 9100200021121.

It is a happy number.

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 1211200020019 - 2¹⁵ = 1211199987251 is a prime.

It is a super-2 number, since 2×1211200020019² (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 = 1211200019978 and 1211200020005.

It is not an unprimeable number, because it can be changed into a prime (1211200020089) 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 in 3 ways as a sum of consecutive naturals, for example, 55054546354 + ... + 55054546375.

It is an arithmetic number, because the mean of its divisors is an integer number (330327278190).

Almost surely, 2^{1211200020019} is an apocalyptic number.

1211200020019 is a deficient number, since it is larger than the sum of its proper divisors (110109092741).

1211200020019 is a wasteful number, since it uses less digits than its factorization.

1211200020019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110109092740.

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

The spelling of 1211200020019 in words is "one trillion, two hundred eleven billion, two hundred million, twenty thousand, nineteen".