211221249 has 8 divisors (see below), whose sum is σ = 281886720. Its totient is φ = 140684976.

The previous prime is 211221247. The next prime is 211221301. The reversal of 211221249 is 942122112.

211221249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211221249 - 2¹ = 211221247 is a prime.

It is a super-2 number, since 2×211221249² = 89228832058240002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28417 + ... + 35070.

It is an arithmetic number, because the mean of its divisors is an integer number (35235840).

Almost surely, 2^211221249 is an apocalyptic number.

It is an amenable number.

211221249 is a deficient number, since it is larger than the sum of its proper divisors (70665471).

211221249 is a wasteful number, since it uses less digits than its factorization.

211221249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64599.

The product of its digits is 576, while the sum is 24.

The square root of 211221249 is about 14533.4527556256. The cubic root of 211221249 is about 595.5421924999.

The spelling of 211221249 in words is "two hundred eleven million, two hundred twenty-one thousand, two hundred forty-nine".