211221132 has 12 divisors (see below), whose sum is σ = 492849336. Its totient is φ = 70407040.

The previous prime is 211221091. The next prime is 211221169. The reversal of 211221132 is 231122112.

211221132 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×211221132² = 89228733206722848, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8800869 + ... + 8800892.

It is an arithmetic number, because the mean of its divisors is an integer number (41070778).

Almost surely, 2^211221132 is an apocalyptic number.

It is an amenable number.

211221132 is an abundant number, since it is smaller than the sum of its proper divisors (281628204).

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

211221132 is a wasteful number, since it uses less digits than its factorization.

211221132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17601768 (or 17601766 counting only the distinct ones).

The product of its digits is 48, while the sum is 15.

The square root of 211221132 is about 14533.4487304287. The cubic root of 211221132 is about 595.5420825387.

Adding to 211221132 its reverse (231122112), we get a palindrome (442343244).

The spelling of 211221132 in words is "two hundred eleven million, two hundred twenty-one thousand, one hundred thirty-two".