211420505566 has 16 divisors (see below), whose sum is σ = 326142677520. Its totient is φ = 102714013440.

The previous prime is 211420505533. The next prime is 211420505591. The reversal of 211420505566 is 665505024112.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1878355 + ... + 1987726.

It is an arithmetic number, because the mean of its divisors is an integer number (20383917345).

Almost surely, 2^211420505566 is an apocalyptic number.

211420505566 is a deficient number, since it is larger than the sum of its proper divisors (114722171954).

211420505566 is a wasteful number, since it uses less digits than its factorization.

211420505566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3866859.

The product of its (nonzero) digits is 72000, while the sum is 37.

Adding to 211420505566 its reverse (665505024112), we get a palindrome (876925529678).

The spelling of 211420505566 in words is "two hundred eleven billion, four hundred twenty million, five hundred five thousand, five hundred sixty-six".