211240308681 has 12 divisors (see below), whose sum is σ = 318391190208. Its totient is φ = 134703964824.

The previous prime is 211240308637. The next prime is 211240308683. The reversal of 211240308681 is 186803042112.

It is a de Polignac number, because none of the positive numbers 2^k-211240308681 is a prime.

It is a super-2 number, since 2×211240308681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211240308683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 510242085 + ... + 510242498.

It is an arithmetic number, because the mean of its divisors is an integer number (26532599184).

Almost surely, 2^211240308681 is an apocalyptic number.

It is an amenable number.

211240308681 is a deficient number, since it is larger than the sum of its proper divisors (107150881527).

211240308681 is a wasteful number, since it uses less digits than its factorization.

211240308681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020484612 (or 1020484609 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The spelling of 211240308681 in words is "two hundred eleven billion, two hundred forty million, three hundred eight thousand, six hundred eighty-one".