11021811989 has 2 divisors, whose sum is σ = 11021811990. Its totient is φ = 11021811988.

The previous prime is 11021811979. The next prime is 11021812103. The reversal of 11021811989 is 98911812011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10359779089 + 662032900 = 101783^2 + 25730^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021811989 - 2⁸ = 11021811733 is a prime.

It is a super-2 number, since 2×11021811989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11021811959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510905994 + 5510905995.

It is an arithmetic number, because the mean of its divisors is an integer number (5510905995).

Almost surely, 2^11021811989 is an apocalyptic number.

It is an amenable number.

11021811989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021811989 is an equidigital number, since it uses as much as digits as its factorization.

11021811989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 41.

The spelling of 11021811989 in words is "eleven billion, twenty-one million, eight hundred eleven thousand, nine hundred eighty-nine".