211005121049 has 2 divisors, whose sum is σ = 211005121050. Its totient is φ = 211005121048.

The previous prime is 211005121043. The next prime is 211005121087. The reversal of 211005121049 is 940121500112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120431209024 + 90573912025 = 347032^2 + 300955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211005121049 is a prime.

It is a super-2 number, since 2×211005121049² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211005121043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105502560524 + 105502560525.

It is an arithmetic number, because the mean of its divisors is an integer number (105502560525).

Almost surely, 2^211005121049 is an apocalyptic number.

It is an amenable number.

211005121049 is a deficient number, since it is larger than the sum of its proper divisors (1).

211005121049 is an equidigital number, since it uses as much as digits as its factorization.

211005121049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 26.

The spelling of 211005121049 in words is "two hundred eleven billion, five million, one hundred twenty-one thousand, forty-nine".