16072821 has 6 divisors (see below), whose sum is σ = 23216310. Its totient is φ = 10715208.

The previous prime is 16072817. The next prime is 16072877. The reversal of 16072821 is 12827061.

16072821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 15563025 + 509796 = 3945^2 + 714^2 .

It is not a de Polignac number, because 16072821 - 2² = 16072817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16072801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 892926 + ... + 892943.

It is an arithmetic number, because the mean of its divisors is an integer number (3869385).

Almost surely, 2^16072821 is an apocalyptic number.

It is an amenable number.

16072821 is a deficient number, since it is larger than the sum of its proper divisors (7143489).

16072821 is a wasteful number, since it uses less digits than its factorization.

16072821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785875 (or 1785872 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 16072821 is about 4009.0922912799. The cubic root of 16072821 is about 252.3659177678.

Adding to 16072821 its reverse (12827061), we get a palindrome (28899882).

The spelling of 16072821 in words is "sixteen million, seventy-two thousand, eight hundred twenty-one".