216123221076 has 48 divisors (see below), whose sum is σ = 576447854976. Its totient is φ = 61736713344.

The previous prime is 216123221057. The next prime is 216123221077. The reversal of 216123221076 is 670122321612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216123221077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145890 + ... + 673446.

It is an arithmetic number, because the mean of its divisors is an integer number (12009330312).

Almost surely, 2^216123221076 is an apocalyptic number.

It is an amenable number.

216123221076 is an abundant number, since it is smaller than the sum of its proper divisors (360324633900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216123221076 is a wasteful number, since it uses less digits than its factorization.

216123221076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532448 (or 532446 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

Adding to 216123221076 its reverse (670122321612), we get a palindrome (886245542688).

The spelling of 216123221076 in words is "two hundred sixteen billion, one hundred twenty-three million, two hundred twenty-one thousand, seventy-six".