16121338 has 16 divisors (see below), whose sum is σ = 25798824. Its totient is φ = 7528960.

The previous prime is 16121311. The next prime is 16121341. The reversal of 16121338 is 83312161.

It can be written as a sum of positive squares in 4 ways, for example, as 14085009 + 2036329 = 3753^2 + 1427^2 .

It is an unprimeable number.

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, 2928 + ... + 6388.

Almost surely, 2^16121338 is an apocalyptic number.

16121338 is a deficient number, since it is larger than the sum of its proper divisors (9677486).

16121338 is a wasteful number, since it uses less digits than its factorization.

16121338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3617.

The product of its digits is 864, while the sum is 25.

The square root of 16121338 is about 4015.1386028380. The cubic root of 16121338 is about 252.6195910963.

Adding to 16121338 its reverse (83312161), we get a palindrome (99433499).

The spelling of 16121338 in words is "sixteen million, one hundred twenty-one thousand, three hundred thirty-eight".