211221153 has 48 divisors (see below), whose sum is σ = 360237696. Its totient is φ = 117573120.

The previous prime is 211221091. The next prime is 211221169. The reversal of 211221153 is 351122112.

It is not a de Polignac number, because 211221153 - 2¹² = 211217057 is a prime.

It is a super-2 number, since 2×211221153² = 89228750949298818, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221553) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 433476 + ... + 433962.

It is an arithmetic number, because the mean of its divisors is an integer number (7504952).

Almost surely, 2^211221153 is an apocalyptic number.

It is an amenable number.

211221153 is a deficient number, since it is larger than the sum of its proper divisors (149016543).

211221153 is a wasteful number, since it uses less digits than its factorization.

211221153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854 (or 851 counting only the distinct ones).

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

The square root of 211221153 is about 14533.4494529000. The cubic root of 211221153 is about 595.5421022753.

Adding to 211221153 its reverse (351122112), we get a palindrome (562343265).

The spelling of 211221153 in words is "two hundred eleven million, two hundred twenty-one thousand, one hundred fifty-three".