11012231221 has 2 divisors, whose sum is σ = 11012231222. Its totient is φ = 11012231220.

The previous prime is 11012231207. The next prime is 11012231239. The reversal of 11012231221 is 12213221011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10751408721 + 260822500 = 103689^2 + 16150^2 .

It is a cyclic number.

It is not a de Polignac number, because 11012231221 - 2⁷ = 11012231093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11012231195 and 11012231204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11012231521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5506115610 + 5506115611.

It is an arithmetic number, because the mean of its divisors is an integer number (5506115611).

Almost surely, 2^11012231221 is an apocalyptic number.

It is an amenable number.

11012231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11012231221 is an equidigital number, since it uses as much as digits as its factorization.

11012231221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 11012231221 its reverse (12213221011), we get a palindrome (23225452232).

It can be divided in two parts, 1101 and 2231221, that added together give a palindrome (2232322).

The spelling of 11012231221 in words is "eleven billion, twelve million, two hundred thirty-one thousand, two hundred twenty-one".