211231023010020 has 72 divisors (see below), whose sum is σ = 690021341840376. Its totient is φ = 51995328740352.

The previous prime is 211231023010009. The next prime is 211231023010037. The reversal of 211231023010020 is 20010320132112.

211231023010020 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 310 + 230 + 100 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 42560905872384 + 168670117137636 = 6523872^2 + 12987306^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 211231023009975 and 211231023010002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45134831637 + ... + 45134836316.

It is an arithmetic number, because the mean of its divisors is an integer number (9583629747783).

Almost surely, 2^{211231023010020} is an apocalyptic number.

211231023010020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211231023010020 is an abundant number, since it is smaller than the sum of its proper divisors (478790318830356).

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

211231023010020 is a wasteful number, since it uses less digits than its factorization.

211231023010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90269667981 (or 90269667976 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 211231023010020 its reverse (20010320132112), we get a palindrome (231241343142132).

The spelling of 211231023010020 in words is "two hundred eleven trillion, two hundred thirty-one billion, twenty-three million, ten thousand, twenty".