16121811 has 8 divisors (see below), whose sum is σ = 21515200. Its totient is φ = 10738152.

The previous prime is 16121803. The next prime is 16121839. The reversal of 16121811 is 11812161.

It is a happy number.

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

It is not a de Polignac number, because 16121811 - 2³ = 16121803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16121801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3516 + ... + 6678.

It is an arithmetic number, because the mean of its divisors is an integer number (2689400).

Almost surely, 2^16121811 is an apocalyptic number.

16121811 is a deficient number, since it is larger than the sum of its proper divisors (5393389).

16121811 is a wasteful number, since it uses less digits than its factorization.

16121811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4865.

The product of its digits is 96, while the sum is 21.

The square root of 16121811 is about 4015.1975044822. The cubic root of 16121811 is about 252.6220616914.

Adding to 16121811 its reverse (11812161), we get a palindrome (27933972).

The spelling of 16121811 in words is "sixteen million, one hundred twenty-one thousand, eight hundred eleven".