11240121312221 has 2 divisors, whose sum is σ = 11240121312222. Its totient is φ = 11240121312220.

The previous prime is 11240121312187. The next prime is 11240121312239. The reversal of 11240121312221 is 12221312104211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10104801228025 + 1135320084196 = 3178805^2 + 1065514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11240121312221 is a prime.

It is a super-2 number, since 2×11240121312221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11240121612221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5620060656110 + 5620060656111.

It is an arithmetic number, because the mean of its divisors is an integer number (5620060656111).

Almost surely, 2^{11240121312221} is an apocalyptic number.

It is an amenable number.

11240121312221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11240121312221 is an equidigital number, since it uses as much as digits as its factorization.

11240121312221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 11240121312221 its reverse (12221312104211), we get a palindrome (23461433416432).

The spelling of 11240121312221 in words is "eleven trillion, two hundred forty billion, one hundred twenty-one million, three hundred twelve thousand, two hundred twenty-one".