11220120131221 has 4 divisors (see below), whose sum is σ = 11523366621292. Its totient is φ = 10916873641152.

The previous prime is 11220120131189. The next prime is 11220120131239. The reversal of 11220120131221 is 12213102102211.

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 7581128958225 + 3638991172996 = 2753385^2 + 1907614^2 .

It is a cyclic number.

It is not a de Polignac number, because 11220120131221 - 2⁵ = 11220120131189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220120131261) 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, 151623244980 + ... + 151623245053.

It is an arithmetic number, because the mean of its divisors is an integer number (2880841655323).

Almost surely, 2^{11220120131221} is an apocalyptic number.

It is an amenable number.

11220120131221 is a deficient number, since it is larger than the sum of its proper divisors (303246490071).

11220120131221 is an equidigital number, since it uses as much as digits as its factorization.

11220120131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303246490070.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 11220120131221 its reverse (12213102102211), we get a palindrome (23433222233432).

The spelling of 11220120131221 in words is "eleven trillion, two hundred twenty billion, one hundred twenty million, one hundred thirty-one thousand, two hundred twenty-one".