11020120121221 has 4 divisors (see below), whose sum is σ = 11034677744332. Its totient is φ = 11005562498112.

The previous prime is 11020120121203. The next prime is 11020120121261. The reversal of 11020120121221 is 12212102102011.

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 2441840644321 + 8578279476900 = 1562639^2 + 2928870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11020120121221 is a prime.

It is a super-2 number, since 2×11020120121221² (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 = 11020120121195 and 11020120121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11020120121261) 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, 7278810420 + ... + 7278811933.

It is an arithmetic number, because the mean of its divisors is an integer number (2758669436083).

Almost surely, 2^{11020120121221} is an apocalyptic number.

It is an amenable number.

11020120121221 is a deficient number, since it is larger than the sum of its proper divisors (14557623111).

11020120121221 is an equidigital number, since it uses as much as digits as its factorization.

11020120121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14557623110.

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

Adding to 11020120121221 its reverse (12212102102011), we get a palindrome (23232222223232).

The spelling of 11020120121221 in words is "eleven trillion, twenty billion, one hundred twenty million, one hundred twenty-one thousand, two hundred twenty-one".