2440121555221 has 4 divisors (see below), whose sum is σ = 2788710348832. Its totient is φ = 2091532761612.

The previous prime is 2440121555219. The next prime is 2440121555239. The reversal of 2440121555221 is 1225551210442.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2440121555221 - 2¹ = 2440121555219 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 (2440121550221) 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, 174294396795 + ... + 174294396808.

It is an arithmetic number, because the mean of its divisors is an integer number (697177587208).

Almost surely, 2^{2440121555221} is an apocalyptic number.

It is an amenable number.

2440121555221 is a deficient number, since it is larger than the sum of its proper divisors (348588793611).

2440121555221 is an equidigital number, since it uses as much as digits as its factorization.

2440121555221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348588793610.

The product of its (nonzero) digits is 32000, while the sum is 34.

Adding to 2440121555221 its reverse (1225551210442), we get a palindrome (3665672765663).

The spelling of 2440121555221 in words is "two trillion, four hundred forty billion, one hundred twenty-one million, five hundred fifty-five thousand, two hundred twenty-one".