221407345744446 has 8 divisors (see below), whose sum is σ = 442814691488904. Its totient is φ = 73802448581480.

The previous prime is 221407345744337. The next prime is 221407345744447. The reversal of 221407345744446 is 644447543704122.

It is a sphenic number, since it is the product of 3 distinct primes.

221407345744446 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221407345744447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18450612145365 + ... + 18450612145376.

It is an arithmetic number, because the mean of its divisors is an integer number (55351836436113).

Almost surely, 2^{221407345744446} is an apocalyptic number.

221407345744446 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221407345744446 is a wasteful number, since it uses less digits than its factorization.

221407345744446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36901224290746.

The product of its (nonzero) digits is 72253440, while the sum is 57.

The spelling of 221407345744446 in words is "two hundred twenty-one trillion, four hundred seven billion, three hundred forty-five million, seven hundred forty-four thousand, four hundred forty-six".