221401220243 has 8 divisors (see below), whose sum is σ = 253154077440. Its totient is φ = 189679390920.

The previous prime is 221401220197. The next prime is 221401220291. The reversal of 221401220243 is 342022104122.

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 221401220243 - 2¹² = 221401216147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221401220743) 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, 7741673 + ... + 7770218.

It is an arithmetic number, because the mean of its divisors is an integer number (31644259680).

Almost surely, 2^221401220243 is an apocalyptic number.

221401220243 is a deficient number, since it is larger than the sum of its proper divisors (31752857197).

221401220243 is a wasteful number, since it uses less digits than its factorization.

221401220243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15513937.

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

Adding to 221401220243 its reverse (342022104122), we get a palindrome (563423324365).

The spelling of 221401220243 in words is "two hundred twenty-one billion, four hundred one million, two hundred twenty thousand, two hundred forty-three".