1211203020005 has 16 divisors (see below), whose sum is σ = 1609240163904. Its totient is φ = 867727534080.

The previous prime is 1211203019981. The next prime is 1211203020017. The reversal of 1211203020005 is 5000203021121.

It is a happy number.

It is not a de Polignac number, because 1211203020005 - 2¹⁸ = 1211202757861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 164338652 + ... + 164346021.

It is an arithmetic number, because the mean of its divisors is an integer number (100577510244).

Almost surely, 2^{1211203020005} is an apocalyptic number.

It is an amenable number.

1211203020005 is a deficient number, since it is larger than the sum of its proper divisors (398037143899).

1211203020005 is a wasteful number, since it uses less digits than its factorization.

1211203020005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328684756.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 1211203020005 its reverse (5000203021121), we get a palindrome (6211406041126).

The spelling of 1211203020005 in words is "one trillion, two hundred eleven billion, two hundred three million, twenty thousand, five".