211820102 has 16 divisors (see below), whose sum is σ = 362299392. Its totient is φ = 92012160.

The previous prime is 211820101. The next prime is 211820111. The reversal of 211820102 is 201028112.

It is a happy number.

It is a super-2 number, since 2×211820102² = 89735511222580808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211820101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239174 + ... + 240057.

It is an arithmetic number, because the mean of its divisors is an integer number (22643712).

Almost surely, 2^211820102 is an apocalyptic number.

211820102 is a deficient number, since it is larger than the sum of its proper divisors (150479290).

211820102 is a wasteful number, since it uses less digits than its factorization.

211820102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479263.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 211820102 is about 14554.0407447554. The cubic root of 211820102 is about 596.1044871086.

Adding to 211820102 its reverse (201028112), we get a palindrome (412848214).

The spelling of 211820102 in words is "two hundred eleven million, eight hundred twenty thousand, one hundred two".