221131112112021 has 4 divisors (see below), whose sum is σ = 294841482816032. Its totient is φ = 147420741408012.

The previous prime is 221131112111999. The next prime is 221131112112049. The reversal of 221131112112021 is 120211211131122.

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 221131112112021 - 2²⁷ = 221130977894293 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 (221131112112721) 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, 36855185352001 + ... + 36855185352006.

It is an arithmetic number, because the mean of its divisors is an integer number (73710370704008).

Almost surely, 2^{221131112112021} is an apocalyptic number.

It is an amenable number.

221131112112021 is a deficient number, since it is larger than the sum of its proper divisors (73710370704011).

221131112112021 is an equidigital number, since it uses as much as digits as its factorization.

221131112112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73710370704010.

The product of its (nonzero) digits is 96, while the sum is 21.

Adding to 221131112112021 its reverse (120211211131122), we get a palindrome (341342323243143).

The spelling of 221131112112021 in words is "two hundred twenty-one trillion, one hundred thirty-one billion, one hundred twelve million, one hundred twelve thousand, twenty-one".