221232012765 has 16 divisors (see below), whose sum is σ = 354320673408. Its totient is φ = 117873922496.

The previous prime is 221232012721. The next prime is 221232012839. The reversal of 221232012765 is 567210232122.

It is a cyclic number.

It is not a de Polignac number, because 221232012765 - 2²⁰ = 221230964189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7264569 + ... + 7294958.

It is an arithmetic number, because the mean of its divisors is an integer number (22145042088).

Almost surely, 2^221232012765 is an apocalyptic number.

It is an amenable number.

221232012765 is a deficient number, since it is larger than the sum of its proper divisors (133088660643).

221232012765 is a wasteful number, since it uses less digits than its factorization.

221232012765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14560548.

The product of its (nonzero) digits is 20160, while the sum is 33.

Adding to 221232012765 its reverse (567210232122), we get a palindrome (788442244887).

The spelling of 221232012765 in words is "two hundred twenty-one billion, two hundred thirty-two million, twelve thousand, seven hundred sixty-five".