16061821 has 8 divisors (see below), whose sum is σ = 17902080. Its totient is φ = 14321088.

The previous prime is 16061819. The next prime is 16061861. The reversal of 16061821 is 12816061.

16061821 = 536² + 537² + ... + 586².

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

It is a cyclic number.

It is not a de Polignac number, because 16061821 - 2¹ = 16061819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16061861) 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, 24541 + ... + 25186.

It is an arithmetic number, because the mean of its divisors is an integer number (2237760).

Almost surely, 2^16061821 is an apocalyptic number.

It is an amenable number.

16061821 is a deficient number, since it is larger than the sum of its proper divisors (1840259).

16061821 is a wasteful number, since it uses less digits than its factorization.

16061821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49763.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 16061821 is about 4007.7201748625. The cubic root of 16061821 is about 252.3083328002.

Adding to 16061821 its reverse (12816061), we get a palindrome (28877882).

The spelling of 16061821 in words is "sixteen million, sixty-one thousand, eight hundred twenty-one".