32121216 has 48 divisors (see below), whose sum is σ = 92435460. Its totient is φ = 10706688.

The previous prime is 32121161. The next prime is 32121253. The reversal of 32121216 is 61212123.

It is a tau number, because it is divible by the number of its divisors (48).

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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12790 + ... + 15093.

Almost surely, 2^32121216 is an apocalyptic number.

32121216 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

32121216 is an abundant number, since it is smaller than the sum of its proper divisors (60314244).

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

32121216 is a wasteful number, since it uses less digits than its factorization.

32121216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27903 (or 27888 counting only the distinct ones).

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

The square root of 32121216 is about 5667.5582043769. The cubic root of 32121216 is about 317.8805769678.

Adding to 32121216 its reverse (61212123), we get a palindrome (93333339).

The spelling of 32121216 in words is "thirty-two million, one hundred twenty-one thousand, two hundred sixteen".