221121131221 has 8 divisors (see below), whose sum is σ = 230768218944. Its totient is φ = 211476804000.

The previous prime is 221121131213. The next prime is 221121131269. The reversal of 221121131221 is 122131121122.

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 221121131221 - 2³ = 221121131213 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 (221121131201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525591 + ... + 847636.

It is an arithmetic number, because the mean of its divisors is an integer number (28846027368).

Almost surely, 2^221121131221 is an apocalyptic number.

It is an amenable number.

221121131221 is a deficient number, since it is larger than the sum of its proper divisors (9647087723).

221121131221 is a wasteful number, since it uses less digits than its factorization.

221121131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380251.

The product of its digits is 96, while the sum is 19.

Adding to 221121131221 its reverse (122131121122), we get a palindrome (343252252343).

The spelling of 221121131221 in words is "two hundred twenty-one billion, one hundred twenty-one million, one hundred thirty-one thousand, two hundred twenty-one".