16821082 has 8 divisors (see below), whose sum is σ = 25251156. Its totient is φ = 8404032.

The previous prime is 16821071. The next prime is 16821083. The reversal of 16821082 is 28012861.

It can be written as a sum of positive squares in 2 ways, for example, as 16329681 + 491401 = 4041^2 + 701^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 16821082.

It is not an unprimeable number, because it can be changed into a prime (16821083) 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, 1188 + ... + 5920.

Almost surely, 2^16821082 is an apocalyptic number.

16821082 is a deficient number, since it is larger than the sum of its proper divisors (8430074).

16821082 is a wasteful number, since it uses less digits than its factorization.

16821082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6512.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 16821082 is about 4101.3512407498. The cubic root of 16821082 is about 256.2229198430. Note that the first 3 decimals are identical.

The spelling of 16821082 in words is "sixteen million, eight hundred twenty-one thousand, eighty-two".