211420660446 has 24 divisors (see below), whose sum is σ = 485023868784. Its totient is φ = 66328050240.

The previous prime is 211420660417. The next prime is 211420660489. The reversal of 211420660446 is 644066024112.

211420660446 is a `hidden beast` number, since 2 + 1 + 1 + 4 + 2 + 0 + 6 + 604 + 46 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 211420660446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 345458290 + ... + 345458901.

It is an arithmetic number, because the mean of its divisors is an integer number (20209327866).

Almost surely, 2^211420660446 is an apocalyptic number.

211420660446 is an abundant number, since it is smaller than the sum of its proper divisors (273603208338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211420660446 is a wasteful number, since it uses less digits than its factorization.

211420660446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690917216 (or 690917213 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

Adding to 211420660446 its reverse (644066024112), we get a palindrome (855486684558).

The spelling of 211420660446 in words is "two hundred eleven billion, four hundred twenty million, six hundred sixty thousand, four hundred forty-six".