221232012766 has 16 divisors (see below), whose sum is σ = 332959623264. Its totient is φ = 110245934304.

The previous prime is 221232012721. The next prime is 221232012839. The reversal of 221232012766 is 667210232122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 848271 + ... + 1077973.

It is an arithmetic number, because the mean of its divisors is an integer number (20809976454).

Almost surely, 2^221232012766 is an apocalyptic number.

221232012766 is a deficient number, since it is larger than the sum of its proper divisors (111727610498).

221232012766 is a wasteful number, since it uses less digits than its factorization.

221232012766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231315.

The product of its (nonzero) digits is 24192, while the sum is 34.

Adding to 221232012766 its reverse (667210232122), we get a palindrome (888442244888).

The spelling of 221232012766 in words is "two hundred twenty-one billion, two hundred thirty-two million, twelve thousand, seven hundred sixty-six".