281120121021221 has 4 divisors (see below), whose sum is σ = 285884868835200. Its totient is φ = 276355373207244.

The previous prime is 281120121021191. The next prime is 281120121021241. The reversal of 281120121021221 is 122120121021182.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 281120121021221 - 2¹⁴ = 281120121004837 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 (281120121021241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2382373906901 + ... + 2382373907018.

It is an arithmetic number, because the mean of its divisors is an integer number (71471217208800).

Almost surely, 2^{281120121021221} is an apocalyptic number.

It is an amenable number.

281120121021221 is a deficient number, since it is larger than the sum of its proper divisors (4764747813979).

281120121021221 is an equidigital number, since it uses as much as digits as its factorization.

281120121021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4764747813978.

The product of its (nonzero) digits is 512, while the sum is 26.

The spelling of 281120121021221 in words is "two hundred eighty-one trillion, one hundred twenty billion, one hundred twenty-one million, twenty-one thousand, two hundred twenty-one".