211005121087 has 2 divisors, whose sum is σ = 211005121088. Its totient is φ = 211005121086.

The previous prime is 211005121049. The next prime is 211005121139. The reversal of 211005121087 is 780121500112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211005121087 is a prime.

It is a super-2 number, since 2×211005121087² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211005121007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105502560543 + 105502560544.

It is an arithmetic number, because the mean of its divisors is an integer number (105502560544).

Almost surely, 2^211005121087 is an apocalyptic number.

211005121087 is a deficient number, since it is larger than the sum of its proper divisors (1).

211005121087 is an equidigital number, since it uses as much as digits as its factorization.

211005121087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 28.

Adding to 211005121087 its reverse (780121500112), we get a palindrome (991126621199).

The spelling of 211005121087 in words is "two hundred eleven billion, five million, one hundred twenty-one thousand, eighty-seven".