211131020 has 48 divisors (see below), whose sum is σ = 460524960. Its totient is φ = 81209856.

The previous prime is 211131013. The next prime is 211131029. The reversal of 211131020 is 20131112.

It is a junction number, because it is equal to n+sod(n) for n = 211130992 and 211131010.

It is not an unprimeable number, because it can be changed into a prime (211131029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180959 + ... + 182121.

It is an arithmetic number, because the mean of its divisors is an integer number (9594270).

Almost surely, 2^211131020 is an apocalyptic number.

211131020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211131020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230262480).

211131020 is an abundant number, since it is smaller than the sum of its proper divisors (249393940).

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

211131020 is a wasteful number, since it uses less digits than its factorization.

211131020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514 (or 1512 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 211131020 is about 14530.3482408372. The cubic root of 211131020 is about 595.4573796476.

Adding to 211131020 its reverse (20131112), we get a palindrome (231262132).

The spelling of 211131020 in words is "two hundred eleven million, one hundred thirty-one thousand, twenty".