11021091660 has 60 divisors (see below), whose sum is σ = 34573577808. Its totient is φ = 2938957344.

The previous prime is 11021091643. The next prime is 11021091661. The reversal of 11021091660 is 6619012011.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×11021091660² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (11021091661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3399952 + ... + 3403191.

Almost surely, 2^11021091660 is an apocalyptic number.

11021091660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11021091660 is an abundant number, since it is smaller than the sum of its proper divisors (23552486148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11021091660 is a wasteful number, since it uses less digits than its factorization.

11021091660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6803164 (or 6803153 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The spelling of 11021091660 in words is "eleven billion, twenty-one million, ninety-one thousand, six hundred sixty".