11021111009 has 2 divisors, whose sum is σ = 11021111010. Its totient is φ = 11021111008.

The previous prime is 11021110957. The next prime is 11021111021. The reversal of 11021111009 is 90011112011.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10423797409 + 597313600 = 102097^2 + 24440^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021111009 - 2²⁰ = 11020062433 is a prime.

It is not a weakly prime, because it can be changed into another prime (11021111039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510555504 + 5510555505.

It is an arithmetic number, because the mean of its divisors is an integer number (5510555505).

Almost surely, 2^11021111009 is an apocalyptic number.

It is an amenable number.

11021111009 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021111009 is an equidigital number, since it uses as much as digits as its factorization.

11021111009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 17.

It can be divided in two parts, 1102 and 1111009, that added together give a palindrome (1112111).

The spelling of 11021111009 in words is "eleven billion, twenty-one million, one hundred eleven thousand, nine".