211071326661 has 64 divisors (see below), whose sum is σ = 348726336000. Its totient is φ = 125280691200.

The previous prime is 211071326659. The next prime is 211071326689. The reversal of 211071326661 is 166623170112.

It is not a de Polignac number, because 211071326661 - 2¹ = 211071326659 is a prime.

It is a super-2 number, since 2×211071326661² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211071326611) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10260336 + ... + 10280886.

It is an arithmetic number, because the mean of its divisors is an integer number (5448849000).

Almost surely, 2^211071326661 is an apocalyptic number.

It is an amenable number.

211071326661 is a deficient number, since it is larger than the sum of its proper divisors (137655009339).

211071326661 is a wasteful number, since it uses less digits than its factorization.

211071326661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21611 (or 21605 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

Adding to 211071326661 its reverse (166623170112), we get a palindrome (377694496773).

The spelling of 211071326661 in words is "two hundred eleven billion, seventy-one million, three hundred twenty-six thousand, six hundred sixty-one".