211055221366 has 64 divisors (see below), whose sum is σ = 374499417600. Its totient is φ = 88264915200.

The previous prime is 211055221331. The next prime is 211055221373. The reversal of 211055221366 is 663122550112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1030975 + ... + 1218613.

It is an arithmetic number, because the mean of its divisors is an integer number (5851553400).

Almost surely, 2^211055221366 is an apocalyptic number.

211055221366 is a deficient number, since it is larger than the sum of its proper divisors (163444196234).

211055221366 is a wasteful number, since it uses less digits than its factorization.

211055221366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187765.

The product of its (nonzero) digits is 21600, while the sum is 34.

Adding to 211055221366 its reverse (663122550112), we get a palindrome (874177771478).

The spelling of 211055221366 in words is "two hundred eleven billion, fifty-five million, two hundred twenty-one thousand, three hundred sixty-six".