221411712640665 has 32 divisors (see below), whose sum is σ = 354476006035200. Its totient is φ = 118013841285120.

The previous prime is 221411712640543. The next prime is 221411712640697. The reversal of 221411712640665 is 566046217114122.

It is a happy number.

It is not a de Polignac number, because 221411712640665 - 2¹⁰ = 221411712639641 is a prime.

It is a Curzon 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, 216313356 + ... + 217334514.

It is an arithmetic number, because the mean of its divisors is an integer number (11077375188600).

Almost surely, 2^{221411712640665} is an apocalyptic number.

It is an amenable number.

221411712640665 is a deficient number, since it is larger than the sum of its proper divisors (133064293394535).

221411712640665 is a wasteful number, since it uses less digits than its factorization.

221411712640665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030017.

The product of its (nonzero) digits is 967680, while the sum is 48.

Adding to 221411712640665 its reverse (566046217114122), we get a palindrome (787457929754787).

The spelling of 221411712640665 in words is "two hundred twenty-one trillion, four hundred eleven billion, seven hundred twelve million, six hundred forty thousand, six hundred sixty-five".