11021111021 has 2 divisors, whose sum is σ = 11021111022. Its totient is φ = 11021111020.

The previous prime is 11021111009. The next prime is 11021111039. The reversal of 11021111021 is 12011112011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6017104900 + 5004006121 = 77570^2 + 70739^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021111021 - 2⁶ = 11021110957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11021110993 and 11021111011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11021111081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510555510 + 5510555511.

It is an arithmetic number, because the mean of its divisors is an integer number (5510555511).

Almost surely, 2^11021111021 is an apocalyptic number.

It is an amenable number.

11021111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021111021 is an equidigital number, since it uses as much as digits as its factorization.

11021111021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11021111021 its reverse (12011112011), we get a palindrome (23032223032).

The spelling of 11021111021 in words is "eleven billion, twenty-one million, one hundred eleven thousand, twenty-one".