11121021212221 has 8 divisors (see below), whose sum is σ = 11130455445120. Its totient is φ = 11111588881008.

The previous prime is 11121021212149. The next prime is 11121021212261. The reversal of 11121021212221 is 12221212012111.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11121021212221 is a prime.

It is a super-2 number, since 2×11121021212221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121021212261) 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, 11350035 + ... + 12290863.

It is an arithmetic number, because the mean of its divisors is an integer number (1391306930640).

Almost surely, 2^{11121021212221} is an apocalyptic number.

It is an amenable number.

11121021212221 is a deficient number, since it is larger than the sum of its proper divisors (9434232899).

11121021212221 is an equidigital number, since it uses as much as digits as its factorization.

11121021212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950843.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11121021212221 its reverse (12221212012111), we get a palindrome (23342233224332).

The spelling of 11121021212221 in words is "eleven trillion, one hundred twenty-one billion, twenty-one million, two hundred twelve thousand, two hundred twenty-one".