16121684 has 6 divisors (see below), whose sum is σ = 28212954. Its totient is φ = 8060840.

The previous prime is 16121681. The next prime is 16121687. The reversal of 16121684 is 48612161.

It is an interprime number because it is at equal distance from previous prime (16121681) and next prime (16121687).

It can be written as a sum of positive squares in only one way, i.e., 15382084 + 739600 = 3922^2 + 860^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16121681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2015207 + ... + 2015214.

It is an arithmetic number, because the mean of its divisors is an integer number (4702159).

Almost surely, 2^16121684 is an apocalyptic number.

It is an amenable number.

16121684 is a deficient number, since it is larger than the sum of its proper divisors (12091270).

16121684 is a wasteful number, since it uses less digits than its factorization.

16121684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030425 (or 4030423 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 16121684 is about 4015.1816895378. The cubic root of 16121684 is about 252.6213983440.

The spelling of 16121684 in words is "sixteen million, one hundred twenty-one thousand, six hundred eighty-four".