11213122131221 has 2 divisors, whose sum is σ = 11213122131222. Its totient is φ = 11213122131220.

The previous prime is 11213122131199. The next prime is 11213122131251. The reversal of 11213122131221 is 12213122131211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8275374123025 + 2937748008196 = 2876695^2 + 1713986^2 .

It is a cyclic number.

It is not a de Polignac number, because 11213122131221 - 2¹⁴ = 11213122114837 is a prime.

It is a super-2 number, since 2×11213122131221² (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 (11213122131251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606561065610 + 5606561065611.

It is an arithmetic number, because the mean of its divisors is an integer number (5606561065611).

Almost surely, 2^{11213122131221} is an apocalyptic number.

It is an amenable number.

11213122131221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11213122131221 is an equidigital number, since it uses as much as digits as its factorization.

11213122131221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 23.

Adding to 11213122131221 its reverse (12213122131211), we get a palindrome (23426244262432).

The spelling of 11213122131221 in words is "eleven trillion, two hundred thirteen billion, one hundred twenty-two million, one hundred thirty-one thousand, two hundred twenty-one".