211550030505 has 32 divisors (see below), whose sum is σ = 410278849920. Its totient is φ = 102569711040.

The previous prime is 211550030501. The next prime is 211550030537. The reversal of 211550030505 is 505030055112.

211550030505 is a `hidden beast` number, since 2 + 1 + 155 + 0 + 0 + 3 + 0 + 505 = 666.

It is not a de Polignac number, because 211550030505 - 2² = 211550030501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (211550030501) 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 in 31 ways as a sum of consecutive naturals, for example, 71227482 + ... + 71230451.

It is an arithmetic number, because the mean of its divisors is an integer number (12821214060).

Almost surely, 2^211550030505 is an apocalyptic number.

It is an amenable number.

211550030505 is a deficient number, since it is larger than the sum of its proper divisors (198728819415).

211550030505 is a wasteful number, since it uses less digits than its factorization.

211550030505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142457958 (or 142457952 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

Adding to 211550030505 its reverse (505030055112), we get a palindrome (716580085617).

The spelling of 211550030505 in words is "two hundred eleven billion, five hundred fifty million, thirty thousand, five hundred five".