221421203572366 has 8 divisors (see below), whose sum is σ = 379579206124080. Its totient is φ = 94894801531008.

The previous prime is 221421203572343. The next prime is 221421203572421. The reversal of 221421203572366 is 663275302124122.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7907900127571 + ... + 7907900127598.

It is an arithmetic number, because the mean of its divisors is an integer number (47447400765510).

Almost surely, 2^{221421203572366} is an apocalyptic number.

221421203572366 is a deficient number, since it is larger than the sum of its proper divisors (158158002551714).

221421203572366 is a wasteful number, since it uses less digits than its factorization.

221421203572366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15815800255178.

The product of its (nonzero) digits is 1451520, while the sum is 46.

Adding to 221421203572366 its reverse (663275302124122), we get a palindrome (884696505696488).

The spelling of 221421203572366 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred three million, five hundred seventy-two thousand, three hundred sixty-six".