1211443205115 has 48 divisors (see below), whose sum is σ = 2294425725984. Its totient is φ = 542184360960.

The previous prime is 1211443205113. The next prime is 1211443205237. The reversal of 1211443205115 is 5115023441121.

It is not a de Polignac number, because 1211443205115 - 2¹ = 1211443205113 is a prime.

It is a super-3 number, since 3×1211443205115³ (a number of 37 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211443205113) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25648014 + ... + 25695203.

It is an arithmetic number, because the mean of its divisors is an integer number (47800535958).

Almost surely, 2^{1211443205115} is an apocalyptic number.

1211443205115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1211443205115 is a deficient number, since it is larger than the sum of its proper divisors (1082982520869).

1211443205115 is a wasteful number, since it uses less digits than its factorization.

1211443205115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51343260 (or 51343249 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 30.

Adding to 1211443205115 its reverse (5115023441121), we get a palindrome (6326466646236).

The spelling of 1211443205115 in words is "one trillion, two hundred eleven billion, four hundred forty-three million, two hundred five thousand, one hundred fifteen".