11220222021221 has 4 divisors (see below), whose sum is σ = 11221705988844. Its totient is φ = 11218738053600.

The previous prime is 11220222021193. The next prime is 11220222021227. The reversal of 11220222021221 is 12212022202211.

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 3704235280321 + 7515986740900 = 1924639^2 + 2741530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11220222021221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11220222021193 and 11220222021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220222021227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 741972470 + ... + 741987591.

It is an arithmetic number, because the mean of its divisors is an integer number (2805426497211).

Almost surely, 2^{11220222021221} is an apocalyptic number.

It is an amenable number.

11220222021221 is a deficient number, since it is larger than the sum of its proper divisors (1483967623).

11220222021221 is an equidigital number, since it uses as much as digits as its factorization.

11220222021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483967622.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 11220222021221 its reverse (12212022202211), we get a palindrome (23432244223432).

The spelling of 11220222021221 in words is "eleven trillion, two hundred twenty billion, two hundred twenty-two million, twenty-one thousand, two hundred twenty-one".