11212210001221 has 8 divisors (see below), whose sum is σ = 11243949888960. Its totient is φ = 11180505839328.

The previous prime is 11212210001203. The next prime is 11212210001227. The reversal of 11212210001221 is 12210001221211.

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 11212210001221 - 2¹¹ = 11212209999173 is a prime.

It is a super-2 number, since 2×11212210001221² (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 = 11212210001195 and 11212210001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212210001227) 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, 8302831 + ... + 9558316.

It is an arithmetic number, because the mean of its divisors is an integer number (1405493736120).

Almost surely, 2^{11212210001221} is an apocalyptic number.

It is an amenable number.

11212210001221 is a deficient number, since it is larger than the sum of its proper divisors (31739887739).

11212210001221 is a wasteful number, since it uses less digits than its factorization.

11212210001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17862923.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 11212210001221 its reverse (12210001221211), we get a palindrome (23422211222432).

The spelling of 11212210001221 in words is "eleven trillion, two hundred twelve billion, two hundred ten million, one thousand, two hundred twenty-one".