21130010020 has 48 divisors (see below), whose sum is σ = 51214157568. Its totient is φ = 7172841600.

The previous prime is 21130009993. The next prime is 21130010021. The reversal of 21130010020 is 2001003112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 21130009979 and 21130010006.

It is not an unprimeable number, because it can be changed into a prime (21130010021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 733032 + ... + 761311.

It is an arithmetic number, because the mean of its divisors is an integer number (1066961616).

Almost surely, 2^21130010020 is an apocalyptic number.

21130010020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21130010020 is an abundant number, since it is smaller than the sum of its proper divisors (30084147548).

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

21130010020 is a wasteful number, since it uses less digits than its factorization.

21130010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494460 (or 1494458 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21130010020 its reverse (2001003112), we get a palindrome (23131013132).

The spelling of 21130010020 in words is "twenty-one billion, one hundred thirty million, ten thousand, twenty".