221213131121 has 16 divisors (see below), whose sum is σ = 224430877440. Its totient is φ = 218016907200.

The previous prime is 221213131093. The next prime is 221213131123. The reversal of 221213131121 is 121131312122.

It is a cyclic number.

It is not a de Polignac number, because 221213131121 - 2¹⁰ = 221213130097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221213131093 and 221213131102.

It is not an unprimeable number, because it can be changed into a prime (221213131123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44968700 + ... + 44973618.

It is an arithmetic number, because the mean of its divisors is an integer number (14026929840).

Almost surely, 2^221213131121 is an apocalyptic number.

It is an amenable number.

221213131121 is a deficient number, since it is larger than the sum of its proper divisors (3217746319).

221213131121 is a wasteful number, since it uses less digits than its factorization.

221213131121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6976.

The product of its digits is 144, while the sum is 20.

Adding to 221213131121 its reverse (121131312122), we get a palindrome (342344443243).

The spelling of 221213131121 in words is "two hundred twenty-one billion, two hundred thirteen million, one hundred thirty-one thousand, one hundred twenty-one".