21001130000 has 50 divisors (see below), whose sum is σ = 50845860054. Its totient is φ = 8400448000.

The previous prime is 21001129997. The next prime is 21001130009. The reversal of 21001130000 is 3110012.

It can be written as a sum of positive squares in 5 ways, for example, as 5234811904 + 15766318096 = 72352^2 + 125564^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is a super-2 number, since 2×21001130000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21001130000.

It is not an unprimeable number, because it can be changed into a prime (21001130009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1040057 + ... + 1060056.

Almost surely, 2^21001130000 is an apocalyptic number.

21001130000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001130000 is an abundant number, since it is smaller than the sum of its proper divisors (29844730054).

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

21001130000 is an equidigital number, since it uses as much as digits as its factorization.

21001130000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100141 (or 2100120 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 8.

Adding to 21001130000 its reverse (3110012), we get a palindrome (21004240012).

The spelling of 21001130000 in words is "twenty-one billion, one million, one hundred thirty thousand".