16521212 has 24 divisors (see below), whose sum is σ = 30834720. Its totient is φ = 7718400.

The previous prime is 16521209. The next prime is 16521217. The reversal of 16521212 is 21212561.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16521217) 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, 9464 + ... + 11072.

It is an arithmetic number, because the mean of its divisors is an integer number (1284780).

Almost surely, 2^16521212 is an apocalyptic number.

It is an amenable number.

16521212 is a deficient number, since it is larger than the sum of its proper divisors (14313508).

16521212 is a wasteful number, since it uses less digits than its factorization.

16521212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781 (or 1779 counting only the distinct ones).

The product of its digits is 240, while the sum is 20.

The square root of 16521212 is about 4064.6293803987. The cubic root of 16521212 is about 254.6912166545.

Adding to 16521212 its reverse (21212561), we get a palindrome (37733773).

The spelling of 16521212 in words is "sixteen million, five hundred twenty-one thousand, two hundred twelve".