21302030100021 has 16 divisors (see below), whose sum is σ = 31984279799808. Its totient is φ = 12493859295600.

The previous prime is 21302030099969. The next prime is 21302030100053. The reversal of 21302030100021 is 12000103020312.

It is not a de Polignac number, because 21302030100021 - 2¹⁸ = 21302029837877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302030100521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10411548391 + ... + 10411550436.

It is an arithmetic number, because the mean of its divisors is an integer number (1999017487488).

Almost surely, 2^{21302030100021} is an apocalyptic number.

It is an amenable number.

21302030100021 is a deficient number, since it is larger than the sum of its proper divisors (10682249699787).

21302030100021 is a wasteful number, since it uses less digits than its factorization.

21302030100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20823098872.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21302030100021 its reverse (12000103020312), we get a palindrome (33302133120333).

The spelling of 21302030100021 in words is "twenty-one trillion, three hundred two billion, thirty million, one hundred thousand, twenty-one".