211000655550 has 48 divisors (see below), whose sum is σ = 534415295232. Its totient is φ = 55069672800.

The previous prime is 211000655543. The next prime is 211000655561. The reversal of 211000655550 is 55556000112.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14957536 + ... + 14971635.

It is an arithmetic number, because the mean of its divisors is an integer number (11133651984).

Almost surely, 2^211000655550 is an apocalyptic number.

211000655550 is an abundant number, since it is smaller than the sum of its proper divisors (323414639682).

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

211000655550 is a wasteful number, since it uses less digits than its factorization.

211000655550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29929233 (or 29929228 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

Adding to 211000655550 its reverse (55556000112), we get a palindrome (266556655662).

The spelling of 211000655550 in words is "two hundred eleven billion, six hundred fifty-five thousand, five hundred fifty".