11211313021 has 2 divisors, whose sum is σ = 11211313022. Its totient is φ = 11211313020.

The previous prime is 11211312989. The next prime is 11211313093. The reversal of 11211313021 is 12031311211.

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., 7351176121 + 3860136900 = 85739^2 + 62130^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211313021 - 2⁵ = 11211312989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11211312986 and 11211313004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211313621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605656510 + 5605656511.

It is an arithmetic number, because the mean of its divisors is an integer number (5605656511).

Almost surely, 2^11211313021 is an apocalyptic number.

It is an amenable number.

11211313021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211313021 is an equidigital number, since it uses as much as digits as its factorization.

11211313021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 11211313021 its reverse (12031311211), we get a palindrome (23242624232).

The spelling of 11211313021 in words is "eleven billion, two hundred eleven million, three hundred thirteen thousand, twenty-one".