1211101202005 has 4 divisors (see below), whose sum is σ = 1453321442412. Its totient is φ = 968880961600.

The previous prime is 1211101201967. The next prime is 1211101202011. The reversal of 1211101202005 is 5002021011121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 950872666129 + 260228535876 = 975127^2 + 510126^2 .

It is not a de Polignac number, because 1211101202005 - 2²³ = 1211092813397 is a prime.

It is a super-2 number, since 2×1211101202005² (a number of 25 digits) contains 22 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 1211101202005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121110120196 + ... + 121110120205.

It is an arithmetic number, because the mean of its divisors is an integer number (363330360603).

Almost surely, 2^{1211101202005} is an apocalyptic number.

It is an amenable number.

1211101202005 is a deficient number, since it is larger than the sum of its proper divisors (242220240407).

1211101202005 is an equidigital number, since it uses as much as digits as its factorization.

1211101202005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242220240406.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 1211101202005 its reverse (5002021011121), we get a palindrome (6213122213126).

The spelling of 1211101202005 in words is "one trillion, two hundred eleven billion, one hundred one million, two hundred two thousand, five".