1211511130005 has 32 divisors (see below), whose sum is σ = 2118841804800. Its totient is φ = 586231503680.

The previous prime is 1211511129967. The next prime is 1211511130031. The reversal of 1211511130005 is 5000311151121.

It is a de Polignac number, because none of the positive numbers 2^k-1211511130005 is a prime.

It is a super-2 number, since 2×1211511130005² (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 (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7215705 + ... + 7381694.

It is an arithmetic number, because the mean of its divisors is an integer number (66213806400).

Almost surely, 2^{1211511130005} is an apocalyptic number.

1211511130005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211511130005 is a deficient number, since it is larger than the sum of its proper divisors (907330674795).

1211511130005 is a wasteful number, since it uses less digits than its factorization.

1211511130005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14597921.

The product of its (nonzero) digits is 150, while the sum is 21.

Adding to 1211511130005 its reverse (5000311151121), we get a palindrome (6211822281126).

The spelling of 1211511130005 in words is "one trillion, two hundred eleven billion, five hundred eleven million, one hundred thirty thousand, five".