216420144111 has 24 divisors (see below), whose sum is σ = 324553202064. Its totient is φ = 144116184960.

The previous prime is 216420144079. The next prime is 216420144133. The reversal of 216420144111 is 111441024612.

It is a happy number.

216420144111 is a `hidden beast` number, since 2 + 1 + 6 + 4 + 201 + 441 + 11 = 666.

It is not a de Polignac number, because 216420144111 - 2⁵ = 216420144079 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216420144911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 291376 + ... + 719541.

It is an arithmetic number, because the mean of its divisors is an integer number (13523050086).

Almost surely, 2^216420144111 is an apocalyptic number.

216420144111 is a deficient number, since it is larger than the sum of its proper divisors (108133057953).

216420144111 is an equidigital number, since it uses as much as digits as its factorization.

216420144111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011813 (or 1011801 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

Adding to 216420144111 its reverse (111441024612), we get a palindrome (327861168723).

The spelling of 216420144111 in words is "two hundred sixteen billion, four hundred twenty million, one hundred forty-four thousand, one hundred eleven".