11111021009 has 24 divisors (see below), whose sum is σ = 12400196256. Its totient is φ = 9872144000.

The previous prime is 11111021003. The next prime is 11111021011. The reversal of 11111021009 is 90012011111.

It is a happy number.

It is not a de Polignac number, because 11111021009 - 2⁴ = 11111020993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111021003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9312917 + ... + 9314109.

It is an arithmetic number, because the mean of its divisors is an integer number (516674844).

Almost surely, 2^11111021009 is an apocalyptic number.

It is an amenable number.

11111021009 is a deficient number, since it is larger than the sum of its proper divisors (1289175247).

11111021009 is a wasteful number, since it uses less digits than its factorization.

11111021009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489 (or 1388 counting only the distinct ones).

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

It can be divided in two parts, 1111102 and 1009, that added together give a palindrome (1112111).

The spelling of 11111021009 in words is "eleven billion, one hundred eleven million, twenty-one thousand, nine".