16121885 has 16 divisors (see below), whose sum is σ = 21057456. Its totient is φ = 11778048.

The previous prime is 16121879. The next prime is 16121887. The reversal of 16121885 is 58812161.

It can be written as a sum of positive squares in 8 ways, for example, as 1666681 + 14455204 = 1291^2 + 3802^2 .

It is a cyclic number.

It is not a de Polignac number, because 16121885 - 2¹⁴ = 16105501 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 (16121887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5027 + ... + 7583.

It is an arithmetic number, because the mean of its divisors is an integer number (1316091).

Almost surely, 2^16121885 is an apocalyptic number.

It is an amenable number.

16121885 is a deficient number, since it is larger than the sum of its proper divisors (4935571).

16121885 is a wasteful number, since it uses less digits than its factorization.

16121885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2672.

The product of its digits is 3840, while the sum is 32.

The square root of 16121885 is about 4015.2067194604. The cubic root of 16121885 is about 252.6224482072.

The spelling of 16121885 in words is "sixteen million, one hundred twenty-one thousand, eight hundred eighty-five".