11101331221 has 2 divisors, whose sum is σ = 11101331222. Its totient is φ = 11101331220.

The previous prime is 11101331201. The next prime is 11101331249. The reversal of 11101331221 is 12213310111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7788062500 + 3313268721 = 88250^2 + 57561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11101331221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11101331195 and 11101331204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11101331201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550665610 + 5550665611.

It is an arithmetic number, because the mean of its divisors is an integer number (5550665611).

Almost surely, 2^11101331221 is an apocalyptic number.

It is an amenable number.

11101331221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11101331221 is an equidigital number, since it uses as much as digits as its factorization.

11101331221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 11101331221 its reverse (12213310111), we get a palindrome (23314641332).

It can be divided in two parts, 1110 and 1331221, that added together give a palindrome (1332331).

The spelling of 11101331221 in words is "eleven billion, one hundred one million, three hundred thirty-one thousand, two hundred twenty-one".