221440021223 has 4 divisors (see below), whose sum is σ = 221449091088. Its totient is φ = 221430951360.

The previous prime is 221440021219. The next prime is 221440021237. The reversal of 221440021223 is 322120044122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221440021223 - 2² = 221440021219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221440021213) 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, 4498211 + ... + 4547172.

It is an arithmetic number, because the mean of its divisors is an integer number (55362272772).

Almost surely, 2^221440021223 is an apocalyptic number.

221440021223 is a deficient number, since it is larger than the sum of its proper divisors (9069865).

221440021223 is an equidigital number, since it uses as much as digits as its factorization.

221440021223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9069864.

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

Adding to 221440021223 its reverse (322120044122), we get a palindrome (543560065345).

The spelling of 221440021223 in words is "two hundred twenty-one billion, four hundred forty million, twenty-one thousand, two hundred twenty-three".