211013221 has 8 divisors (see below), whose sum is σ = 226846080. Its totient is φ = 195653088.

The previous prime is 211013161. The next prime is 211013237. The reversal of 211013221 is 122310112.

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

It is a cyclic number.

It is not a de Polignac number, because 211013221 - 2¹³ = 211005029 is a prime.

It is a super-4 number, since 4×211013221⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211013261) 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, 117256 + ... + 119041.

It is an arithmetic number, because the mean of its divisors is an integer number (28355760).

Almost surely, 2^211013221 is an apocalyptic number.

It is an amenable number.

211013221 is a deficient number, since it is larger than the sum of its proper divisors (15832859).

211013221 is a wasteful number, since it uses less digits than its factorization.

211013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236363.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 211013221 is about 14526.2941247932. The cubic root of 211013221 is about 595.3466153563.

Adding to 211013221 its reverse (122310112), we get a palindrome (333323333).

The spelling of 211013221 in words is "two hundred eleven million, thirteen thousand, two hundred twenty-one".