216220960889 has 4 divisors (see below), whose sum is σ = 225621872256. Its totient is φ = 206820049524.

The previous prime is 216220960847. The next prime is 216220960939. The reversal of 216220960889 is 988069022612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216220960889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216220960889.

It is not an unprimeable number, because it can be changed into a prime (216220560889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4700455649 + ... + 4700455694.

It is an arithmetic number, because the mean of its divisors is an integer number (56405468064).

Almost surely, 2^216220960889 is an apocalyptic number.

It is an amenable number.

216220960889 is a deficient number, since it is larger than the sum of its proper divisors (9400911367).

216220960889 is an equidigital number, since it uses as much as digits as its factorization.

216220960889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9400911366.

The product of its (nonzero) digits is 1492992, while the sum is 53.

The spelling of 216220960889 in words is "two hundred sixteen billion, two hundred twenty million, nine hundred sixty thousand, eight hundred eighty-nine".