221640356350767 has 16 divisors (see below), whose sum is σ = 300122432406368. Its totient is φ = 145466741790720.

The previous prime is 221640356350759. The next prime is 221640356350783. The reversal of 221640356350767 is 767053653046122.

It is not a de Polignac number, because 221640356350767 - 2³ = 221640356350759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221640356350747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 935238658 + ... + 935475615.

It is an arithmetic number, because the mean of its divisors is an integer number (18757652025398).

Almost surely, 2^{221640356350767} is an apocalyptic number.

221640356350767 is a deficient number, since it is larger than the sum of its proper divisors (78482076055601).

221640356350767 is a wasteful number, since it uses less digits than its factorization.

221640356350767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1870714890.

The product of its (nonzero) digits is 38102400, while the sum is 57.

The spelling of 221640356350767 in words is "two hundred twenty-one trillion, six hundred forty billion, three hundred fifty-six million, three hundred fifty thousand, seven hundred sixty-seven".