211052220381 has 32 divisors (see below), whose sum is σ = 348486652800. Its totient is φ = 125455184640.

The previous prime is 211052220373. The next prime is 211052220383. The reversal of 211052220381 is 183022250112.

211052220381 is a `hidden beast` number, since 2 + 1 + 10 + 52 + 220 + 381 = 666.

It is not a de Polignac number, because 211052220381 - 2³ = 211052220373 is a prime.

It is a super-2 number, since 2×211052220381² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211052220383) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12091510 + ... + 12108951.

It is an arithmetic number, because the mean of its divisors is an integer number (10890207900).

Almost surely, 2^211052220381 is an apocalyptic number.

It is an amenable number.

211052220381 is a deficient number, since it is larger than the sum of its proper divisors (137434432419).

211052220381 is a wasteful number, since it uses less digits than its factorization.

211052220381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24200506 (or 24200500 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

Adding to 211052220381 its reverse (183022250112), we get a palindrome (394074470493).

The spelling of 211052220381 in words is "two hundred eleven billion, fifty-two million, two hundred twenty thousand, three hundred eighty-one".