440123213221 has 2 divisors, whose sum is σ = 440123213222. Its totient is φ = 440123213220.

The previous prime is 440123213219. The next prime is 440123213267. The reversal of 440123213221 is 122312321044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 340384730625 + 99738482596 = 583425^2 + 315814^2 .

It is a cyclic number.

It is not a de Polignac number, because 440123213221 - 2¹ = 440123213219 is a prime.

Together with 440123213219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440123243221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220061606610 + 220061606611.

It is an arithmetic number, because the mean of its divisors is an integer number (220061606611).

Almost surely, 2^440123213221 is an apocalyptic number.

It is an amenable number.

440123213221 is a deficient number, since it is larger than the sum of its proper divisors (1).

440123213221 is an equidigital number, since it uses as much as digits as its factorization.

440123213221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 440123213221 its reverse (122312321044), we get a palindrome (562435534265).

The spelling of 440123213221 in words is "four hundred forty billion, one hundred twenty-three million, two hundred thirteen thousand, two hundred twenty-one".