211523112 has 96 divisors (see below), whose sum is σ = 616735080. Its totient is φ = 65249280.

The previous prime is 211523101. The next prime is 211523113. The reversal of 211523112 is 211325112.

It can be written as a sum of positive squares in 4 ways, for example, as 143856036 + 67667076 = 11994^2 + 8226^2 .

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

It is not an unprimeable number, because it can be changed into a prime (211523113) 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 23 ways as a sum of consecutive naturals, for example, 73248 + ... + 76080.

Almost surely, 2^211523112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211523112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (308367540).

211523112 is an abundant number, since it is smaller than the sum of its proper divisors (405211968).

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

211523112 is a wasteful number, since it uses less digits than its factorization.

211523112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2923 (or 2916 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 211523112 is about 14543.8341574703. The cubic root of 211523112 is about 595.8257602158.

Adding to 211523112 its reverse (211325112), we get a palindrome (422848224).

The spelling of 211523112 in words is "two hundred eleven million, five hundred twenty-three thousand, one hundred twelve".