221534404134765 has 32 divisors (see below), whose sum is σ = 378467673661440. Its totient is φ = 110386404803136.

The previous prime is 221534404134737. The next prime is 221534404134781. The reversal of 221534404134765 is 567431404435122.

It is not a de Polignac number, because 221534404134765 - 2²⁰ = 221534403086189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7466598045 + ... + 7466627714.

It is an arithmetic number, because the mean of its divisors is an integer number (11827114801920).

Almost surely, 2^{221534404134765} is an apocalyptic number.

It is an amenable number.

221534404134765 is a deficient number, since it is larger than the sum of its proper divisors (156933269526675).

221534404134765 is a wasteful number, since it uses less digits than its factorization.

221534404134765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14933225833.

The product of its (nonzero) digits is 9676800, while the sum is 51.

Adding to 221534404134765 its reverse (567431404435122), we get a palindrome (788965808569887).

The spelling of 221534404134765 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, four hundred four million, one hundred thirty-four thousand, seven hundred sixty-five".