11011222221221 has 8 divisors (see below), whose sum is σ = 11490146706240. Its totient is φ = 10532312377312.

The previous prime is 11011222221173. The next prime is 11011222221283. The reversal of 11011222221221 is 12212222211011.

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 11011222221221 - 2⁶ = 11011222221157 is a prime.

It is a super-2 number, since 2×11011222221221² (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 = 11011222221193 and 11011222221202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011222221721) 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, 2109431 + ... + 5145108.

It is an arithmetic number, because the mean of its divisors is an integer number (1436268338280).

Almost surely, 2^{11011222221221} is an apocalyptic number.

It is an amenable number.

11011222221221 is a deficient number, since it is larger than the sum of its proper divisors (478924485019).

11011222221221 is an equidigital number, since it uses as much as digits as its factorization.

11011222221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7320555.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 11011222221221 its reverse (12212222211011), we get a palindrome (23223444432232).

The spelling of 11011222221221 in words is "eleven trillion, eleven billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".