21033101000 has 64 divisors (see below), whose sum is σ = 49244373360. Its totient is φ = 8408640000.

The previous prime is 21033100967. The next prime is 21033101009. The reversal of 21033101000 is 10133012.

It can be written as a sum of positive squares in 8 ways, for example, as 4439023876 + 16594077124 = 66626^2 + 128818^2 .

It is not an unprimeable number, because it can be changed into a prime (21033101009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2276390 + ... + 2285610.

Almost surely, 2^21033101000 is an apocalyptic number.

21033101000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21033101000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24622186680).

21033101000 is an abundant number, since it is smaller than the sum of its proper divisors (28211272360).

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

21033101000 is a wasteful number, since it uses less digits than its factorization.

21033101000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11523 (or 11509 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 21033101000 its reverse (10133012), we get a palindrome (21043234012).

The spelling of 21033101000 in words is "twenty-one billion, thirty-three million, one hundred one thousand".