21030130021 has 8 divisors (see below), whose sum is σ = 21719477504. Its totient is φ = 20341467360.

The previous prime is 21030130001. The next prime is 21030130049. The reversal of 21030130021 is 12003103012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21030130021 - 2²⁷ = 20895912293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21030129983 and 21030130010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030130001) 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 7 ways as a sum of consecutive naturals, for example, 108411 + ... + 231976.

It is an arithmetic number, because the mean of its divisors is an integer number (2714934688).

Almost surely, 2^21030130021 is an apocalyptic number.

It is an amenable number.

21030130021 is a deficient number, since it is larger than the sum of its proper divisors (689347483).

21030130021 is a wasteful number, since it uses less digits than its factorization.

21030130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342411.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21030130021 its reverse (12003103012), we get a palindrome (33033233033).

The spelling of 21030130021 in words is "twenty-one billion, thirty million, one hundred thirty thousand, twenty-one".