21010020130 has 48 divisors (see below), whose sum is σ = 42189174720. Its totient is φ = 7525948320.

The previous prime is 21010020113. The next prime is 21010020131. The reversal of 21010020130 is 3102001012.

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

It is not an unprimeable number, because it can be changed into a prime (21010020131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48510 + ... + 210649.

It is an arithmetic number, because the mean of its divisors is an integer number (878941140).

Almost surely, 2^21010020130 is an apocalyptic number.

21010020130 is an abundant number, since it is smaller than the sum of its proper divisors (21179154590).

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

21010020130 is a wasteful number, since it uses less digits than its factorization.

21010020130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259255 (or 259244 counting only the distinct ones).

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

Adding to 21010020130 its reverse (3102001012), we get a palindrome (24112021142).

The spelling of 21010020130 in words is "twenty-one billion, ten million, twenty thousand, one hundred thirty".