216432061021 has 8 divisors (see below), whose sum is σ = 236357036064. Its totient is φ = 196548641520.

The previous prime is 216432060989. The next prime is 216432061073. The reversal of 216432061021 is 120160234612.

216432061021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216432061021 - 2⁵ = 216432060989 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 (216432161021) by changing a digit.

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, 10377990 + ... + 10398823.

It is an arithmetic number, because the mean of its divisors is an integer number (29544629508).

Almost surely, 2^216432061021 is an apocalyptic number.

It is an amenable number.

216432061021 is a deficient number, since it is larger than the sum of its proper divisors (19924975043).

216432061021 is a wasteful number, since it uses less digits than its factorization.

216432061021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20777771.

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 216432061021 its reverse (120160234612), we get a palindrome (336592295633).

The spelling of 216432061021 in words is "two hundred sixteen billion, four hundred thirty-two million, sixty-one thousand, twenty-one".