21110212 has 12 divisors (see below), whose sum is σ = 37309356. Its totient is φ = 10450400.

The previous prime is 21110189. The next prime is 21110227. The reversal of 21110212 is 21201112.

It can be written as a sum of positive squares in 2 ways, for example, as 14638276 + 6471936 = 3826^2 + 2544^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25723 + ... + 26530.

It is an arithmetic number, because the mean of its divisors is an integer number (3109113).

Almost surely, 2^21110212 is an apocalyptic number.

It is an amenable number.

21110212 is a deficient number, since it is larger than the sum of its proper divisors (16199144).

21110212 is a wasteful number, since it uses less digits than its factorization.

21110212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52358 (or 52356 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 21110212 is about 4594.5850737580. The cubic root of 21110212 is about 276.3742210727.

Adding to 21110212 its reverse (21201112), we get a palindrome (42311324).

The spelling of 21110212 in words is "twenty-one million, one hundred ten thousand, two hundred twelve".