211591800116 has 12 divisors (see below), whose sum is σ = 370346505060. Its totient is φ = 105778512960.

The previous prime is 211591800107. The next prime is 211591800157. The reversal of 211591800116 is 611008195112.

It can be written as a sum of positive squares in 2 ways, for example, as 84242740516 + 127349059600 = 290246^2 + 356860^2 .

It is a super-2 number, since 2×211591800116² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4319375 + ... + 4368086.

It is an arithmetic number, because the mean of its divisors is an integer number (30862208755).

Almost surely, 2^211591800116 is an apocalyptic number.

It is an amenable number.

211591800116 is a deficient number, since it is larger than the sum of its proper divisors (158754704944).

211591800116 is a wasteful number, since it uses less digits than its factorization.

211591800116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8693554 (or 8693552 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 35.

Adding to 211591800116 its reverse (611008195112), we get a palindrome (822599995228).

The spelling of 211591800116 in words is "two hundred eleven billion, five hundred ninety-one million, eight hundred thousand, one hundred sixteen".