211220113 has 16 divisors (see below), whose sum is σ = 231952896. Its totient is φ = 191157120.

The previous prime is 211220099. The next prime is 211220117. The reversal of 211220113 is 311022112.

It is a cyclic number.

It is not a de Polignac number, because 211220113 - 2⁹ = 211219601 is a prime.

It is a super-2 number, since 2×211220113² = 89227872271465538, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211220093 and 211220102.

It is not an unprimeable number, because it can be changed into a prime (211220117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244320 + ... + 245182.

It is an arithmetic number, because the mean of its divisors is an integer number (14497056).

Almost surely, 2^211220113 is an apocalyptic number.

It is an amenable number.

211220113 is a deficient number, since it is larger than the sum of its proper divisors (20732783).

211220113 is a wasteful number, since it uses less digits than its factorization.

211220113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224.

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

The square root of 211220113 is about 14533.4136733253. The cubic root of 211220113 is about 595.5411248404.

Adding to 211220113 its reverse (311022112), we get a palindrome (522242225).

The spelling of 211220113 in words is "two hundred eleven million, two hundred twenty thousand, one hundred thirteen".