211220011100 has 36 divisors (see below), whose sum is σ = 523825629264. Its totient is φ = 72418289280.

The previous prime is 211220011087. The next prime is 211220011127. The reversal of 211220011100 is 1110022112.

It is a super-2 number, since 2×211220011100² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150870737 + ... + 150872136.

It is an arithmetic number, because the mean of its divisors is an integer number (14550711924).

Almost surely, 2^211220011100 is an apocalyptic number.

211220011100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211220011100 is an abundant number, since it is smaller than the sum of its proper divisors (312605618164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211220011100 is a wasteful number, since it uses less digits than its factorization.

211220011100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301742894 (or 301742887 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 211220011100 its reverse (1110022112), we get a palindrome (212330033212).

The spelling of 211220011100 in words is "two hundred eleven billion, two hundred twenty million, eleven thousand, one hundred".