1211211144013 has 8 divisors (see below), whose sum is σ = 1304733724056. Its totient is φ = 1117738920000.

The previous prime is 1211211143981. The next prime is 1211211144029. The reversal of 1211211144013 is 3104411121121.

It can be written as a sum of positive squares in 4 ways, for example, as 47201038564 + 1164010105449 = 217258^2 + 1078893^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211211144013 - 2⁵ = 1211211143981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211217144013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12539038 + ... + 12635263.

It is an arithmetic number, because the mean of its divisors is an integer number (163091715507).

Almost surely, 2^{1211211144013} is an apocalyptic number.

1211211144013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1211211144013 is a deficient number, since it is larger than the sum of its proper divisors (93522580043).

1211211144013 is a wasteful number, since it uses less digits than its factorization.

1211211144013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25178015.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 1211211144013 its reverse (3104411121121), we get a palindrome (4315622265134).

The spelling of 1211211144013 in words is "one trillion, two hundred eleven billion, two hundred eleven million, one hundred forty-four thousand, thirteen".