1211444001205 has 16 divisors (see below), whose sum is σ = 1490970789504. Its totient is φ = 944572075200.

The previous prime is 1211444001197. The next prime is 1211444001217. The reversal of 1211444001205 is 5021004441121.

It is not a de Polignac number, because 1211444001205 - 2³ = 1211444001197 is a prime.

It is a super-3 number, since 3×1211444001205³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211444001205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15097359 + ... + 15177388.

It is an arithmetic number, because the mean of its divisors is an integer number (93185674344).

Almost surely, 2^{1211444001205} is an apocalyptic number.

It is an amenable number.

1211444001205 is a deficient number, since it is larger than the sum of its proper divisors (279526788299).

1211444001205 is a wasteful number, since it uses less digits than its factorization.

1211444001205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30274956.

The product of its (nonzero) digits is 1280, while the sum is 25.

Adding to 1211444001205 its reverse (5021004441121), we get a palindrome (6232448442326).

The spelling of 1211444001205 in words is "one trillion, two hundred eleven billion, four hundred forty-four million, one thousand, two hundred five".