11221210101221 has 16 divisors (see below), whose sum is σ = 11526966468864. Its totient is φ = 10917560130624.

The previous prime is 11221210101181. The next prime is 11221210101239. The reversal of 11221210101221 is 12210101212211.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11221210101221 is a prime.

It is a super-2 number, since 2×11221210101221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11221210101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221210161221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13044395 + ... + 13877991.

It is an arithmetic number, because the mean of its divisors is an integer number (720435404304).

Almost surely, 2^{11221210101221} is an apocalyptic number.

It is an amenable number.

11221210101221 is a deficient number, since it is larger than the sum of its proper divisors (305756367643).

11221210101221 is an equidigital number, since it uses as much as digits as its factorization.

11221210101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834860.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11221210101221 its reverse (12210101212211), we get a palindrome (23431311313432).

The spelling of 11221210101221 in words is "eleven trillion, two hundred twenty-one billion, two hundred ten million, one hundred one thousand, two hundred twenty-one".