216123611 has 4 divisors (see below), whose sum is σ = 235771224. Its totient is φ = 196476000.

The previous prime is 216123569. The next prime is 216123619. The reversal of 216123611 is 116321612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216123611 - 2²² = 211929307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216123619) 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, 9823790 + ... + 9823811.

It is an arithmetic number, because the mean of its divisors is an integer number (58942806).

Almost surely, 2^216123611 is an apocalyptic number.

216123611 is a deficient number, since it is larger than the sum of its proper divisors (19647613).

216123611 is a wasteful number, since it uses less digits than its factorization.

216123611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19647612.

The product of its digits is 432, while the sum is 23.

The square root of 216123611 is about 14701.1431868409. The cubic root of 216123611 is about 600.1144328035.

The spelling of 216123611 in words is "two hundred sixteen million, one hundred twenty-three thousand, six hundred eleven".