216942123889 has 4 divisors (see below), whose sum is σ = 217410681856. Its totient is φ = 216473565924.

The previous prime is 216942123887. The next prime is 216942123901. The reversal of 216942123889 is 988321249612.

It is a happy number.

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 not a de Polignac number, because 216942123889 - 2¹ = 216942123887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216942123887) 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, 234278289 + ... + 234279214.

It is an arithmetic number, because the mean of its divisors is an integer number (54352670464).

Almost surely, 2^216942123889 is an apocalyptic number.

It is an amenable number.

216942123889 is a deficient number, since it is larger than the sum of its proper divisors (468557967).

216942123889 is an equidigital number, since it uses as much as digits as its factorization.

216942123889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468557966.

The product of its digits is 2985984, while the sum is 55.

The spelling of 216942123889 in words is "two hundred sixteen billion, nine hundred forty-two million, one hundred twenty-three thousand, eight hundred eighty-nine".