1211000102005 has 8 divisors (see below), whose sum is σ = 1456753181400. Its totient is φ = 966431375616.

The previous prime is 1211000101951. The next prime is 1211000102017. The reversal of 1211000102005 is 5002010001121.

It can be written as a sum of positive squares in 4 ways, for example, as 615272378449 + 595727723556 = 784393^2 + 771834^2 .

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 1211000102005 - 2²³ = 1210991713397 is a prime.

It is a super-2 number, since 2×1211000102005² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296086000 + ... + 296090089.

It is an arithmetic number, because the mean of its divisors is an integer number (182094147675).

Almost surely, 2^{1211000102005} is an apocalyptic number.

It is an amenable number.

1211000102005 is a deficient number, since it is larger than the sum of its proper divisors (245753079395).

1211000102005 is an equidigital number, since it uses as much as digits as its factorization.

1211000102005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592176503.

The product of its (nonzero) digits is 20, while the sum is 13.

Adding to 1211000102005 its reverse (5002010001121), we get a palindrome (6213010103126).

The spelling of 1211000102005 in words is "one trillion, two hundred eleven billion, one hundred two thousand, five".