211108923081 has 60 divisors (see below), whose sum is σ = 368749732692. Its totient is φ = 120008189952.

The previous prime is 211108923059. The next prime is 211108923097. The reversal of 211108923081 is 180329801112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 50160321225 + 160948601856 = 223965^2 + 401184^2 .

It is not a de Polignac number, because 211108923081 - 2⁵ = 211108923049 is a prime.

It is a super-2 number, since 2×211108923081² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211108973081) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 628221 + ... + 903813.

Almost surely, 2^211108923081 is an apocalyptic number.

211108923081 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211108923081 is a deficient number, since it is larger than the sum of its proper divisors (157640809611).

211108923081 is a wasteful number, since it uses less digits than its factorization.

211108923081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275812 (or 275796 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The spelling of 211108923081 in words is "two hundred eleven billion, one hundred eight million, nine hundred twenty-three thousand, eighty-one".