221221043673 has 32 divisors (see below), whose sum is σ = 364212345600. Its totient is φ = 118976014080.

The previous prime is 221221043633. The next prime is 221221043689. The reversal of 221221043673 is 376340122122.

It is not a de Polignac number, because 221221043673 - 2²¹ = 221218946521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221221043633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6305638 + ... + 6340623.

It is an arithmetic number, because the mean of its divisors is an integer number (11381635800).

Almost surely, 2^221221043673 is an apocalyptic number.

It is an amenable number.

221221043673 is a deficient number, since it is larger than the sum of its proper divisors (142991301927).

221221043673 is a wasteful number, since it uses less digits than its factorization.

221221043673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12646302 (or 12646288 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

Adding to 221221043673 its reverse (376340122122), we get a palindrome (597561165795).

The spelling of 221221043673 in words is "two hundred twenty-one billion, two hundred twenty-one million, forty-three thousand, six hundred seventy-three".