11001121989 has 32 divisors (see below), whose sum is σ = 17270542464. Its totient is φ = 6140897280.

The previous prime is 11001121979. The next prime is 11001122029. The reversal of 11001121989 is 98912110011.

It is not a de Polignac number, because 11001121989 - 2⁹ = 11001121477 is a prime.

It is a super-2 number, since 2×11001121989² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001121919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167997 + ... + 224109.

It is an arithmetic number, because the mean of its divisors is an integer number (539704452).

Almost surely, 2^11001121989 is an apocalyptic number.

It is an amenable number.

11001121989 is a deficient number, since it is larger than the sum of its proper divisors (6269420475).

11001121989 is a wasteful number, since it uses less digits than its factorization.

11001121989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56597.

The product of its (nonzero) digits is 1296, while the sum is 33.

The spelling of 11001121989 in words is "eleven billion, one million, one hundred twenty-one thousand, nine hundred eighty-nine".