11000021000 has 64 divisors (see below), whose sum is σ = 26287822080. Its totient is φ = 4306372800.

The previous prime is 11000020979. The next prime is 11000021017. The reversal of 11000021000 is 12000011.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (5).

11000021000 is a modest number, since divided by 21000 gives 11000 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70022 + ... + 164021.

It is an arithmetic number, because the mean of its divisors is an integer number (410747220).

Almost surely, 2^11000021000 is an apocalyptic number.

11000021000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11000021000 is an abundant number, since it is smaller than the sum of its proper divisors (15287801080).

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

11000021000 is a wasteful number, since it uses less digits than its factorization.

11000021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234111 (or 234097 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

Adding to 11000021000 its reverse (12000011), we get a palindrome (11012021011).

The spelling of 11000021000 in words is "eleven billion, twenty-one thousand".