221411640664516 has 24 divisors (see below), whose sum is σ = 387681990514560. Its totient is φ = 110645359633152.

The previous prime is 221411640664499. The next prime is 221411640664559. The reversal of 221411640664516 is 615466046114122.

It is a super-2 number, since 2×221411640664516² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221411640664516.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 524651505 + ... + 525073351.

It is an arithmetic number, because the mean of its divisors is an integer number (16153416271440).

Almost surely, 2^{221411640664516} is an apocalyptic number.

It is an amenable number.

221411640664516 is a deficient number, since it is larger than the sum of its proper divisors (166270349850044).

221411640664516 is a wasteful number, since it uses less digits than its factorization.

221411640664516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493203 (or 493201 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 49.

Adding to 221411640664516 its reverse (615466046114122), we get a palindrome (836877686778638).

The spelling of 221411640664516 in words is "two hundred twenty-one trillion, four hundred eleven billion, six hundred forty million, six hundred sixty-four thousand, five hundred sixteen".