16121232 has 30 divisors (see below), whose sum is σ = 45117462. Its totient is φ = 5373696.

The previous prime is 16121227. The next prime is 16121239. The reversal of 16121232 is 23212161.

It can be written as a sum of positive squares in only one way, i.e., 11861136 + 4260096 = 3444^2 + 2064^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (16121239) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55833 + ... + 56120.

Almost surely, 2^16121232 is an apocalyptic number.

16121232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16121232 is an abundant number, since it is smaller than the sum of its proper divisors (28996230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16121232 is a wasteful number, since it uses less digits than its factorization.

16121232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111967 (or 111958 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 16121232 is about 4015.1254027739. The cubic root of 16121232 is about 252.6190374257.

Adding to 16121232 its reverse (23212161), we get a palindrome (39333393).

The spelling of 16121232 in words is "sixteen million, one hundred twenty-one thousand, two hundred thirty-two".