221411640406646 has 16 divisors (see below), whose sum is σ = 332139207628800. Its totient is φ = 110698571498088.

The previous prime is 221411640406603. The next prime is 221411640406729. The reversal of 221411640406646 is 646604046114122.

It is a happy number.

It is a super-2 number, since 2×221411640406646² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221411640406646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3308420141 + ... + 3308487063.

It is an arithmetic number, because the mean of its divisors is an integer number (20758700476800).

Almost surely, 2^{221411640406646} is an apocalyptic number.

221411640406646 is a deficient number, since it is larger than the sum of its proper divisors (110727567222154).

221411640406646 is a wasteful number, since it uses less digits than its factorization.

221411640406646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150523.

The product of its (nonzero) digits is 1327104, while the sum is 47.

The spelling of 221411640406646 in words is "two hundred twenty-one trillion, four hundred eleven billion, six hundred forty million, four hundred six thousand, six hundred forty-six".