221440220321 has 8 divisors (see below), whose sum is σ = 234481495680. Its totient is φ = 208400653888.

The previous prime is 221440220297. The next prime is 221440220399. The reversal of 221440220321 is 123022044122.

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

It is a cyclic number.

It is not a de Polignac number, because 221440220321 - 2¹⁸ = 221439958177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221440220621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155501 + ... + 683418.

It is an arithmetic number, because the mean of its divisors is an integer number (29310186960).

Almost surely, 2^221440220321 is an apocalyptic number.

It is an amenable number.

221440220321 is a deficient number, since it is larger than the sum of its proper divisors (13041275359).

221440220321 is a wasteful number, since it uses less digits than its factorization.

221440220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854463.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 221440220321 its reverse (123022044122), we get a palindrome (344462264443).

The spelling of 221440220321 in words is "two hundred twenty-one billion, four hundred forty million, two hundred twenty thousand, three hundred twenty-one".