16521012 has 18 divisors (see below), whose sum is σ = 41761538. Its totient is φ = 5506992.

The previous prime is 16520951. The next prime is 16521023. The reversal of 16521012 is 21012561.

16521012 is a `hidden beast` number, since 1 + 652 + 1 + 0 + 12 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10732176 + 5788836 = 3276^2 + 2406^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 229423 + ... + 229494.

Almost surely, 2^16521012 is an apocalyptic number.

16521012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16521012 is an abundant number, since it is smaller than the sum of its proper divisors (25240526).

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

16521012 is a wasteful number, since it uses less digits than its factorization.

16521012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458927 (or 458922 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 16521012 is about 4064.6047778351. The cubic root of 16521012 is about 254.6901889161.

Adding to 16521012 its reverse (21012561), we get a palindrome (37533573).

The spelling of 16521012 in words is "sixteen million, five hundred twenty-one thousand, twelve".