211991627693 has 24 divisors (see below), whose sum is σ = 229072171776. Its totient is φ = 195964084800.

The previous prime is 211991627671. The next prime is 211991627713. The reversal of 211991627693 is 396726199112.

It is not a de Polignac number, because 211991627693 - 2⁶ = 211991627629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211991627633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12471146 + ... + 12488132.

It is an arithmetic number, because the mean of its divisors is an integer number (9544673824).

Almost surely, 2^211991627693 is an apocalyptic number.

211991627693 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

211991627693 is a deficient number, since it is larger than the sum of its proper divisors (17080544083).

211991627693 is a wasteful number, since it uses less digits than its factorization.

211991627693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17825 (or 17802 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 56.

The spelling of 211991627693 in words is "two hundred eleven billion, nine hundred ninety-one million, six hundred twenty-seven thousand, six hundred ninety-three".