16531212 has 12 divisors (see below), whose sum is σ = 38572856. Its totient is φ = 5510400.

The previous prime is 16531211. The next prime is 16531219. The reversal of 16531212 is 21213561.

It is a tau number, because it is divible by the number of its divisors (12).

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (16531211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 688789 + ... + 688812.

Almost surely, 2^16531212 is an apocalyptic number.

16531212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16531212 is an abundant number, since it is smaller than the sum of its proper divisors (22041644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16531212 is a wasteful number, since it uses less digits than its factorization.

16531212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377608 (or 1377606 counting only the distinct ones).

The product of its digits is 360, while the sum is 21.

The square root of 16531212 is about 4065.8593187665. The cubic root of 16531212 is about 254.7425929997.

Adding to 16531212 its reverse (21213561), we get a palindrome (37744773).

The spelling of 16531212 in words is "sixteen million, five hundred thirty-one thousand, two hundred twelve".