11111021221231 has 8 divisors (see below), whose sum is σ = 11519154534384. Its totient is φ = 10709418041280.

The previous prime is 11111021221193. The next prime is 11111021221243. The reversal of 11111021221231 is 13212212011111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11111021221231 - 2¹⁷ = 11111021090159 is a prime.

It is a super-2 number, since 2×11111021221231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111021221199 and 11111021221208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111021221031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1632529836 + ... + 1632536641.

It is an arithmetic number, because the mean of its divisors is an integer number (1439894316798).

Almost surely, 2^{11111021221231} is an apocalyptic number.

11111021221231 is a deficient number, since it is larger than the sum of its proper divisors (408133313153).

11111021221231 is an equidigital number, since it uses as much as digits as its factorization.

11111021221231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3265066601.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 11111021221231 its reverse (13212212011111), we get a palindrome (24323233232342).

The spelling of 11111021221231 in words is "eleven trillion, one hundred eleven billion, twenty-one million, two hundred twenty-one thousand, two hundred thirty-one".