11222221211021 has 4 divisors (see below), whose sum is σ = 11222260254972. Its totient is φ = 11222182167072.

The previous prime is 11222221210987. The next prime is 11222221211053. The reversal of 11222221211021 is 12011212222211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1481648872900 + 9740572338121 = 1217230^2 + 3120989^2 .

It is a cyclic number.

It is not a de Polignac number, because 11222221211021 - 2⁶ = 11222221210957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11222221210984 and 11222221211002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11222221211321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19087616 + ... + 19666761.

It is an arithmetic number, because the mean of its divisors is an integer number (2805565063743).

Almost surely, 2^{11222221211021} is an apocalyptic number.

It is an amenable number.

11222221211021 is a deficient number, since it is larger than the sum of its proper divisors (39043951).

11222221211021 is an equidigital number, since it uses as much as digits as its factorization.

11222221211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39043950.

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

Adding to 11222221211021 its reverse (12011212222211), we get a palindrome (23233433433232).

The spelling of 11222221211021 in words is "eleven trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred eleven thousand, twenty-one".