211522056 has 64 divisors (see below), whose sum is σ = 551577600. Its totient is φ = 67511808.

The previous prime is 211522049. The next prime is 211522057. The reversal of 211522056 is 650225112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (211522057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87196 + ... + 89588.

It is an arithmetic number, because the mean of its divisors is an integer number (8618400).

Almost surely, 2^211522056 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 211522056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275788800).

211522056 is an abundant number, since it is smaller than the sum of its proper divisors (340055544).

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

211522056 is a wasteful number, since it uses less digits than its factorization.

211522056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2558 (or 2554 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 211522056 is about 14543.7978533807. The cubic root of 211522056 is about 595.8247686882.

Adding to 211522056 its reverse (650225112), we get a palindrome (861747168).

The spelling of 211522056 in words is "two hundred eleven million, five hundred twenty-two thousand, fifty-six".