211131100 has 18 divisors (see below), whose sum is σ = 458154704. Its totient is φ = 84452400.

The previous prime is 211131091. The next prime is 211131101. The reversal of 211131100 is 1131112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211131101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1055556 + ... + 1055755.

Almost surely, 2^211131100 is an apocalyptic number.

211131100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211131100 is an abundant number, since it is smaller than the sum of its proper divisors (247023604).

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

211131100 is a wasteful number, since it uses less digits than its factorization.

211131100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111325 (or 2111318 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 211131100 is about 14530.3509936959. The cubic root of 211131100 is about 595.4574548561.

Adding to 211131100 its reverse (1131112), we get a palindrome (212262212).

The spelling of 211131100 in words is "two hundred eleven million, one hundred thirty-one thousand, one hundred".