1211221444005 has 48 divisors (see below), whose sum is σ = 2103649591680. Its totient is φ = 644693422464.

The previous prime is 1211221443983. The next prime is 1211221444009. The reversal of 1211221444005 is 5004441221121.

1211221444005 is a `hidden beast` number, since 1 + 2 + 1 + 1 + 2 + 214 + 440 + 0 + 5 = 666.

It is not a de Polignac number, because 1211221444005 - 2⁶ = 1211221443941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211221444005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211221444009) 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, 167546731 + ... + 167553959.

It is an arithmetic number, because the mean of its divisors is an integer number (43826033160).

Almost surely, 2^{1211221444005} is an apocalyptic number.

1211221444005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211221444005 is a deficient number, since it is larger than the sum of its proper divisors (892428147675).

1211221444005 is a wasteful number, since it uses less digits than its factorization.

1211221444005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14170 (or 14167 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

Adding to 1211221444005 its reverse (5004441221121), we get a palindrome (6215662665126).

The spelling of 1211221444005 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, four hundred forty-four thousand, five".